It seems firefox 4 has stupidly removed the option to save tabs on exit however there’s a way to get this very useful functionality back. Here’s how:

1. Type about:config in the URL/Location/Address bar and press the Enter key
2. Accept the warning message (promise to be careful)
3. The preferences page/list will open
4. Filter = browser.tabs.warnOnClose
5. If its value is set to false, double-click on it (in the lower panel) to toggle its value to true
6. Repeat steps 4 and 5 for these following 3 preferences also:
   • browser.warnOnQuit
   • browser.warnOnRestart
   • browser.showQuitWarn

Taken from mozilla support. A big thank you to user Helper7677 for this solution!

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Update 2011-10-30: Added instructions for Ubuntu 11.04+

An issue has crept up in the latest version of Ubuntu (10.10 as of writing) whereby installing beta versions of Firefox causes the browser to become the default application for FTP addresses. This is a real annoying development that I’m sure alot of you have a beef with. There’s a very simple fix to change it back to trusty ol’ nautilus:

Open ~/.gconf/desktop/gnome/url-handlers/ftp/%gconf.xml and change the stringvalue link to/usr/bin/nautilus like so:

<?xml version="1.0"?>
<gconf>
	<entry name="needs_terminal" mtime="1287534317" type="bool" value="false"/>
 
	<entry name="enabled" mtime="1287534317" type="bool" value="true"/>
	<entry name="command" mtime="1287534317" type="string">
 
		<stringvalue>/usr/bin/nautilus</stringvalue>
	</entry>
</gconf>

In 11.04+, you’ll also need to open ~/.local/share/applications/mimeapps.list and under [Default Applications] add:

x-scheme-handler/ftp=nautilus.desktop

Courtesy of radu cotescu.

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I installed firefox-4.0 (currently 4.0b8pre) on Ubuntu Maverick RC earlier today and all was going fine and dandy until I had to open a Google Docs spreadsheet. I’d receive a message stating:

The bad news is that Google Docs has just encountered an error.
The good news is that you've helped us find a bug, which we are now looking into.

We apologize for any inconvenience this has caused you.
In the meantime, if you'd like updates on this and other issues, try visiting the Google Docs Help Forum.

Sorry, and thanks for your help!
- The Google Docs Team

I checked documents and they seemed to be fine. It turns out this is an issue with Google not recognising FF4’s user agent string. The easiest way to solve this issue is to type about:config into the address bar and set

general.useragent.compatMode.firefox

to true.

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