Today seems to be Firefox/Iceweasel 3 Bashing Day on Planet Debian, so let me join the fun :)
I agree with most other people that the default Firefox/Iceweasel 3 config is not ideal, so here's what I did to fix it. Some of these items improve performance, some remove annoyances, some remove privacy issues, some remove security issues. Not everything here may be desirable for people other than me.
Select "Edit / Preferences".
Open a new tab, enter "about:config" as URL and hit ENTER. Click the annoying "I'll be careful, I promise!" button. Uncheck "Show this warning next time" while we're at it.
browser.urlbar.matchOnlyTyped = trueto disable the new, annoying "AwesomeBar" URL bar feature (which is also a huge privacy risk).
browser.tabs.tabMinWidth = 60and
browser.tabs.tabMaxWidth = 60(needs a browser restart). You can even use less than
60if you don't need any text and an icon per tab is enough for you.
extentions.getAddons.showPane = false.
bidi.support = 0. You'll probably never need it, so reduce the number of potential bugs and security issues by disabling it.
browser.ssl_override_behavior = 2and
browser.xul.error_pages.expert_bad_cert = true(thanks Pierre Habouzit).
browser.tabs.closeButtons = 3in order to prevent accidental closing of tabs (no more Close buttons on each tab, only one global Close button on the right). Yes,
CTRL+Shift+Thelps in case it still happens.
network.prefetch-next = falseto prevent random prefetching of webpages which means wasting CPU cycles and bandwidth, as well as subtle privacy and security issues.
None. Don't even think about installing crap like the closed-source Flash player if stability or security are important to you. If you absolutely must watch YouTube videos, I recommend youtube-dl.
Use as few as possible. Every extention may have security problems or bugs, and can negatively affect performance etc.
After a recent
apt-get dist-upgrade I noticed that I'm using Firefox/Iceweasel 2.0 now.
Which is nice and all, but it doesn't really fit my way of browsing and TAB-handling. I always have lots of TABs open simultaneously. And by lots I mean 100-600. I'm not kidding. Firefox 2.0 changed TAB sizes and behaviour which makes it completely unusable for me.
A quickfix to make it at least bearable:
about:configin the URL bar.
browser.tabs.tabMinWidth default integer 100
A lot better now...
Now I need an extention which provides me with a scrollbar for the TAB-bar, I cannot click 200 times just to move to a TAB which is 200 TABs away from the current one...