Despite having multiple browsers installed (I am a software tester by trade), I always seem to keep the default browser that shipped with the operating system, Safari on the Mac or Internet Explorer on Windows.
Why did you choose your current browser, and what killer feature(s) would it take to make you switch to another browser?
Chrome. Anything else would have to be snappier or have something going for it which I just haven't seen (and therefore can't say).
I thought I'd miss extensions when moving from Firefox to Chrome, but I really don't. (And of course that's only a temporary difference anyway.)
For a while I was using Chrome on Windows and Firefox on Linux (before the Chrome port was really ready) but I'm so much happier now I've got Chrome on Linux too. Admittedly I still have to switch to Firefox for YouTube, but that'll only be a matter of time :)
(Disclaimer: I work for Google, so I've been using Chrome for a bit longer than most, and I'm obviously biased. I love it though, and I'm looking forward to ChromeOS too.)
Firefox: Because I've been using it for a long time and it works for me (tm). And as long as it does everything I want it to, and there's no obvious reason to abandon it (like being end-of-lifed with no more security updates), I'll stick with it.
My favorite browser is Opera. I have it open all the time. It got everything I need for using the Internets.
Opera has a built-in mail and chat client, which I use to get RSS feeds, my emails and for IRC.
Opera Unite allows me to access my files at home from work (or anywhere, for that matter).
This might very likely turn into a flame-war, but here's the browser I use and have used for over 7 years now as my default browser - Opera.
And I don't think I will ever shift away from Opera anytime soon. I love opera not just for the awesome features it provides -- notes, mouse gestures, IRC, feed reader, good customisability, good default keyboard shortcuts especially single key shortcuts; but also because I think it is one of the best designed browser out there. The UI always works as expected and the default options are extremely usable (unlike Firefox).
I chose it for its speed of startup, speed of operation and the tabbed interface (only one at the time).
I stay with it due to its ability to be used in rodent-free mode (keyboard controls to quickly go to links and open them (either in a new background or the current tab), switching between tabs, etc.).
I don't know of any killer features in the other browsers, but I would like to be enlightened.
(I only use Microsoft Internet Explorer when a corporate reason forces me to.)
Internet Explorer because too many other applications have ActiveX in their help files. Also it's automatically logging me on to internal websites.
edit re brave comment: I don't use IE when I start a browser myself, but it is the default on my system for the reasons above - which is what the question was. What's absurd about it - just practical.
Safari on Mac OS X. I chose it because it's default, and nothing else has ever really done it for me. For me to switch, I'd need something else with a UI that matches the rest of Mac OS X and isn't ugly. I can do without major features; it's the experience that matters to me. (Classic Mac user opinion.
Firefox, mainly because
And, my favorite often overlooked feature of Firefox, smart keywords ! http://support.mozilla.com/en-US/kb/Smart+keywords
Google Chrome on Windows:
Reason, very simple, the omnibox ; integrated web search + address bar without having to grab the mouse at all
With all the other I have to either: tab to go to the search box, or grab the mouse which I hate.
On Mac OS X Firefox:
It has a tremendous integration with the system. But I'm looking forward for Chrome on Mac OS X. http://chrome.blogspot.com/2009/06/get-to-know-omnibox.html
I am using Firefox since version 1.0. I love it because of dozens of add-ons and themes you can install to increase your productivity and the number of things you can monitor.
The rendering speed is very good, and the only drawback is that it uses a lot of RAM, but for me it is not a big problem with 2 GB available. I can afford it.
Real superusers use Lynx ,
or Links ,
or ELinks  http://en.wikipedia.org/wiki/Lynx%5F%28web%5Fbrowser%29
As many people said before me... It's feature-rich, and keeps small.
Mouse gestures, tabbed interface, nice customization (skins, colors, buttons editing, add new buttons, no-menubar option), bookmark shortcuts, Speed Dial, sync, mail, IRC, RSS, torrent (but I never used, I use uTorrent  instead but it's useful for quick downloads), notes, debugger (Dragonfly), Unite (data sharing), side panels, fast searchable history, highly configurable, nice on-the-fly code editor.
Dozen of those features have already been copied to Firefox via extensions... but Opera is my default browser since version 7 (with ads), and it will be for a long time ago, I think. http://www.utorrent.com/
Internet Explorer 8
Switched to IE from Netscape back in the 90's because Netscape had lots of rendering problems. I stuck with IE because its rendering problems were not as bad (web developers usually worked around them) and because I needed to use IE for Windows Update anyway. I disliked the fanboy hype surrounding Firefox. I tried Firefox, Opera, and Safari, but didn't see anything that made me want to switch. Everything that people praised the other browsers for, IE added in their next version.
Nothing better then Opera 10b. I do however have Firefox, and Chrome installed.
I use Opera because everything I need is built in.
Chrome is my second choice and I use it to create desktop shortcuts to applications such as gmail and Grooveshark . However I don't use it fulltime because of
I do use Firefox solely for the web developer toolbar but the reasons I do not use Firefox all the time are:
Reasons for not using Internet Explorer:
I use Firefox primarily because of its extensibility. I like Chrome's security model and speed, though, but I don't use it because it's not officially available on Mac and it lacks the extensibility that Firefox has.
Firefox, because I use both Windows and Linux and like to keep the profiles for both sync'd. Also I couldn't live without some of the extensions such as FireBug.
I like Chrome for speed in Windows, but since it's not on Linux yet it's not a viable browser for me to use as a default. When Chrome becomes available on Linux, then I may re-evaluate my default browser.
If Chrome were to ever get FireBug, then there would be no contest.
When I'm at work (as a web developer) I mainly use Firefox (Firebug is like oxygen to me at this point), begrudgingly use IE in its various incarnations for testing purposes and Chrome/Safari a little bit as well. They all have pros and cons and it usually comes down to what you value in a browser. For me it breaks down like this:
Pros: 1. Extensions 2. User friendly 3. Web standard adherence
Cons: 1. A little slow for my tastes 2. Memory hog (for me at least)
Pros: 1. None
Cons: 1. Too many to list right now
Pros: 1. Both are much quicker to load and eat up way less memory 2. Web standards adherence
Cons: 1. None really, just too lazy to move bookmarks over, or I'd use it primarily at home
There are other aspects about each that I like but these are the ones that affect my decision to use any one of these at a given time. If I'm gonna be sitting there for a while I use Firefox, if I'm just need some quick info I go with Chrome. I go with IE when I need to make sure it doesn't jack up a layout I've coded at work.
Uzbl follows the UNIX philosophy - "Write programs that do one thing and do it well. Write programs to work together. Write programs to handle text streams, because that is a universal interface."
- very minimal graphical interface. You only see what you need
- what is not browsing, is not in uzbl. Things like url changing, loading/saving of bookmarks, saving history, downloads, ... are handled through external scripts that you write
- controllable through various means such as fifo and socket files, stdin, keyboard and more
- advanced, customizable keyboard interface with support for modes, modkeys, multichars, variables (keywords) etc. (eg you can tweak the interface to be vim-like, emacs-like or any-other-program-like)
- focus on plaintext storage for your data and configs in simple, parseable formats
- Uzbl keeps it simple, and puts you in charge.
It's certainly not for everyone, the readme on github  explains this well:
THIS PROJECT IS NOT FOR:
- people want a browser that does everything
- people who want a browser with things like a built-in bookmark manager, address bar, forward/back buttons, ...
- people who expect something that works by default. You'll need to read configs and write/edit scripts
- people who like nothing from this list: mpd, moc, wmii, dwm, awesome, mutt, pine, vim, dmenu, screen, irssi, weechat, bitlbee
Firefox, by far...my experience with it tells me I can do everything I ever wanted to with a browser (sync bookmarks with X marks, maintain passwords, in-depth customization). I've tried some of the others out there (IE, Chrome, etc) and seems like there's always something missing for me.
As far as development goes, I still am able to use Firefox for most things - given the fact that as a general rule I end up using the IE tab  Add-on feature for it since some sites don't behave well on Firefox. You can set the browser to always open certain URLs in the IE tab so you never have to deal with keeping track of which ones & manually switching the rendering engine. https://addons.mozilla.org/en-US/firefox/addon/1419
I use Chrome on my windows machine and Safari on my Mac. Went through a phase where Firefox is on all my machines, but left as I was spending too much time customizing and trying out new extensions.
More often then not I would open Internet Explorer, as A LOT of intranet stuff within the company still opens with only IE. I know this is the problem of the intranet enterprise code, but if you got to use it, you've got to use it.
I would really like to use Opera but incompatibility with so many sites doesn't help even when you pass all the ACID test and is the most Standard-compliant browser.
I use mainly Chrome because it's speedy and it's simplistic looking. Whenever I need to debug or use add-on (like elasticfox), I use Firefox obviously. IE when testing or everything else fails.
I'm using Chrome at the moment because I found Firefox slowing down almost on a daily basis. I tried disabling extensions but nothing seemed to work.
I thought I'd miss AdBlock more than I have.
Now that I've installed FF 3.5 I might go back to using that for general browsing where I'm likely to hit sites with a lot of advertising. For sites like this one with minimal or no adverts I'll stick with Chrome.
I use Safari on Mac OS X because it uses the least CPU. I used to use Firefox, but just sitting around it would use 10%+ of the CPU. A few months ago I switched to Safari, which used 3-4%. Then Safari 4.0.2 came out the other day and it now uses 1-2% at idle. I'm on a laptop so this matters in terms of battery life.
I use Firefox for 2 main reasons:
Firefox, primarily for two add-ons
Ads, particularly the flashy ones, annoy me to no end..
Anything that doesn't have addons is always going to struggle to compete now I'm used to Firebug, LiveHttp headers and so on.
That said, I'd like it more if they'd sort the interface out - even with the best skins it doesn't look quite as slick as IE or Safari.
To me it depends on what I'm doing.
Firefox is unparallelled when it comes to web development, the extensions that are available just makes everything that much easier.
I use Firefox most of the time for all it's extensions and keeping track of my passwords/bookmarks across pc's
I use Chrome for reading Google Reader and random internet searching, since it performs faster on some sites
I have Opera installed for my girlfriend, since she wants to erase her steps every time she stops browsing (don't ask) and thinks it's the best browser in the world
I have IE8 in case a website is really stubborn and won't work in Firefox/Chrome, in which case I will try it there
I use Opera all the time. It's the best browser. It's very fast and customizable. It has so much built-in: Mail, RSS, Chat, SpeedDial, Synchronization (Bookmarks, SpeedDial, etc), Developer Tools (DragonFly, similar to Firebug), Mouse Gestures, Unite, Turbo (for slow connections), Content Blocker (can be used to block ads, etc). In short I think Opera is the best BROWSER and Firefox is the best TOOL for web development.
I have used
Internet Explorer when I was new to Internet.
Now FireFox Itself(3.5.2). It's rocking. Not an advertisement, but the fact.
All of them!
Really, depends on where the mouse pointer ends when I push LMB. And it also depends on situation.
Under Linux, I'm extremely happy with Google Chrome, despite it being very very VERY alpha. Opera with its Opera Turbo is a must under bandwidth constrained GPRS connections. It's also good in other situations, except when some pages break under it. For those pages, when you just want to be sure you're using the right thing, I use Firefox (more precisely, Iceweasel under Debian). And for web development, really, there's no better than Firefox.
Under Windows, it's really all random. Mostly Chrome because of its speed and its cool interface when using web apps such as Gmail. Somewhat rarely I use Firefox, but sometimes I fire up Opera, too.
The only major browser I don't use is Microsoft's Internet Explorer :-)
Camino  on the Mac. Mozilla Power, Mac Style.
For development: Firefox (because it has Firebug) http://caminobrowser.org/
I use mainly Internet Explorer 7.
I have tried to use Opera as default browser, but too many pages are not displayed correctly. I like some of the built-in features, though. I specifically use Opera for pages where I need to log in, because of the way it handles automatic filling in of login credentials.
I use the developer toolbar in Internet Explorer (as plug-in, this is actually included in Internet Explorer 8). This is a very useful tool to extract design parts of a page including HTML and CSS. You can activate a mode where you click on a section of the page, and you get the HTML/CSS details of that element in context with the rest of the structure.
Based on other answers on this post, it would like to try Chrome (I have not tried it before!). One of the reasons I have tried Opera in the firs place is speed, and it looks like speed is one of the good things about Chrome, so I will try it...
I would like to give a list of pros/cons for Internet Explorer as most of other post just say: none/ininity. I actually agree on this in general, but I would like to point out some things:
It handles some of the buggy advanced Microsoft sites very well (some might put this under cons, but...)
Bad implementation of some CSS standards (although this has improved with Internet Explorer 7).
At the beginning of my answer, I told you why I don't use Opera as default. I guess why I turned back to Internet Explorer, is that I am used to it, and why I am used to it? Because it's default on Windows...
One concrete reason for not having Firefox as default, is that it is slow startup. When I tried to start it up just now, I clocked it to 33 seconds!
This post has made me curious on Chrome, so I will try that.
EDIT: I have now installed Chrome, and my first impression is that I like the minimalistic view - very little space taken by toolbar, so much space available for the page content. Very good. And of course it's fast. :-)
My favourite browser is Firefox with two main reasons. The first one is that there are so many great add-ins for Firefox such as Xmarks for syncing bookmarks, Firebug  for debug or reveal information about web pages, and Vimperator .
Vimperator is a add-in only available for Firefox. I just cannot do browsing without it! I have 5 blogs on Vimperator . It was very strange UI after I installed it. All the menu, address bar, and toolbar are gone. It leaves maximized space for web page. Basically, it inherits most vi  keys for your browsing. Literally, you would not need to use mouse. I list some very commonly used keys in my blog. I showed this tool to many of my friends in just minutes and they all love it.
Even I like Chrome and Safari's speed, however, Vimperator is not available for them yet. I am stuck with Firefox. Just love it. Trust me, if you just make a little effort and spend some time to lean those basic keys, it will benefit you for your lifetime. http://en.wikipedia.org/wiki/Firebug_%28web_development%29
Firefox most of the time, but I'm considering switching back to Safari (I was using Safari on Mac before, but came back to Firefox since Safari 4 : more bugs, lost some things I liked in Safari 3, and difficulties to find some plugin features I need). However, Safari is far faster than Firefox, that's incredible ! I'm currently working with a real slow connection from time to time, and in that configuration, Safari is better than Firefox (that can sometimes even not load pages, or load them incorrectly).
So I'm currently switching back to Safari, even if I use Firefox some times for its awesome plugins...:)
Chrome, Internet Explorer 8 and Flockr.
And this is not a joke :)
For anything social, Flockr is a must. Everything is built-in and works pretty well.
For transactions (e.g. banking, paying taxes...), I almost always use Internet Explorer 8. It always works since most corporate websites have been tested using Internet Explorer (and most never got tested using Firefox or Chrome). Same thing for website development : I use Internet Explorer 8 (but it's a corporate decision ;-)
For anything else (and most of the time, I'm doing anything else !), I use Chrome. This is by far my favorite.
I use Firefox most of the time, usually just because it's there the addons are really useful but I could live without most of them. Except mabey Firebug.
I could easily live with Chrome, it seems really light weight whilst still looking pretty.
My default web browser is whatever my clients' Standard Operating Environment dictates. This is generally IE, but the question around which version is generally the biggest issue.
"Favourite web browser" is a different matter - but I prefer to default to whatever the client uses.
Chrome. As the only IT guy in my office of 20+ employees I am constantly in need of very fast answers. Chrome has a faster Internet connection (even on our bonded T1 lines) than any other browser I've used. Pulling up Chrome from Launchy is almost instantaneous which is needed not only for Internet services but also for router, Wi-Fi, printer and other non-Internet resources. It's just fast and reliable.
Firefox all the way with all the add-on support, speed and stability. It can't be beat.
Chrome on Windows and Safari on Mac OS X. Both have a minimal interface and are pretty speedy, which lets me focus on browsing the web, fast.
I use Firefox 3.5, for AdBlock Plus. But I really love the UI of Chrome, so my Firefox installation looks like this:
As you can tell, I really like Chrome...
I have the following extensions installed:
Safari 4 on Mac OS X and Windows. I use this setup because:
I use Firefox for personal uses. It's because I can modify it to meet my specification. I can even modify it's real estate to match Google Chrome:D http://img19.imageshack.us/img19/5231/screenshot013x.png
As for office, I uses Opera for it's feature to not refresh the page when hit back button. I need it for phpMyAdmin . Because I need to hit back to refine my query. On Firefox this will caused phpMyAdmin to refresh and remove my query :( http://en.wikipedia.org/wiki/PhpMyAdmin
Well, I'll post mine as no one else has mentioned it...
I use Flock , which is a variation on Firefox, and is compatible with most Firefox extensions. I NEED my extensions, as someone else mentioned, they are INDISPENSABLE for development work. But, I also rely heavily on RSS for keeping up with everything going on in the world of interest, and i just could NOT find a good RSS extension for Firefox, while Flock has a very nice RSS integration. http://en.wikipedia.org/wiki/Flock%5F%28web%5Fbrowser%29
Firefox because of the add-ons.
Chrome, both at the office (IIS environment) and at home. Using the latest 'unstable' version with little/no problems.
Only use Internet Explorer when I have to (OWA looks a little better in Internet Explorer...)
Firefox. The extensions make browsing better, and some are critical for my job, like Firebug . I dig Safari, and would gladly use it all the time, except for the lack of a good extension architecture. I tried using both for a while, one for work, one for personal stuff, but I prefer keeping it simple. http://en.wikipedia.org/wiki/Firebug%5F%28Firefox%5Fextension%29
When I was with my old computer, I used Chrome (with Windows XP). Reasons:
When I switched to my new powerful PC, I really enjoyed IE 8: Same speed and nearly same performance with correct rendering of web pages: So why make the move to Chrome?
Konqueror  for most websurfing, sharing Firefox and Opera a second place. http://en.wikipedia.org/wiki/Konqueror
I use it over Firefox almost entirely because it uses the Keychain for storing passwords, the Mac OS X Firefox port also wasn't too great (but v3.5 seems much better)
I use it over Safari because it supports my Firefox's
user-content.css without any SIMBL plugins, and because of the Firetabs
At work Firefox. At home Chrome.
Safari. I'm on a Mac and have no need for Firefox extensions. When Chrome is released for Mac I'll give it a shot, but unless it's IMMENSELY faster I won't bother. I like how my Safari bookmarks sync up with my iPhone.
Firefox is my default and best, where I've tried Safari and Google Chrome for a while... Yes, Chrome is fast but looks like a mosquito :)
On Mac OS X, I primarily use OmniWeb . It is nearly as fast as Safari, but the UI is much slicker in my opinion. With widescreen displays, tabs on the side are much better than tabs on the top, once you get used to it.
On Windows, I primarily use Google Chrome. http://www.omnigroup.com/applications/omniweb/
I used to use Firefox due to the amount of add-ons i could get, but now i use safari due to its speed plus it integrates quite well with my iPhone.
I use Safari ad-block so i don't get ads.
For me, it's Firefox with the IETab plugin. I like to be able to view sites in either browser within a single tabbed interface (need to use IE for certain internal sites where I work, and need to ensure IE compatibility with the sites I develop). To switch to another browser, I'd need it to offer the same multiple-engine rendering in a single container.
In Firefox proper, I use the quick links feature a lot, and also have plugins like fast dial, download status bar installed.
Safari 4 on Mac OS X, Safari 4 on Windows.
However I am a developer and web designer so I do use Firefox and IE. I am not extremely fond of Chrome, mainly because there isn't a descent Mac OS X port as yet.