MIA: Firefox titlebar icon
I just installed firefox3 beta and I realized that the little icon in upper right corner of the application (the titlebar) had just disappeared leaving a pretty sad spot in my eyesight.
After symlinking a hundred of different images in $FIREFOX_DIR and /usr/share/pixmaps I finally discovered the right one:
cd /opt/mozilla/lib/firefox-3.0/ mkdir -p chrome/icons/default/ cp icons/default.xpm chrome/icons/default/default.xpm
If the same problem happens while you’re using the normal Firefox just change /opt/mozilla/lib/firefox-3.0 into /usr/lib/firefox 
How to open http links in your emails with Firefox
If you want your Thunderbird open http links in Firefox and not with Epiphany or Konqueror do:
- Go to your ~/.mozilla-thunderbird/ folder
- Go to your profile directory (usually it has a random generated name like 7s37jl21.default)
- Check if a prefs.js file exists in that folder
- Create a new user.js file; if it does exist skip this step
- Open it with your preferred editor (like vi, emacs, nano, kate, gedit …)
- Type in the following line:
user_pref("network.protocol-handler.app.http","/usr/bin/firefox");
- Save & exit.
- Restart Thunderbird.
That’s all 