Thunderbird - changing default browser used to open links in e-mail

Edit or create the file

/home/USER_NAME/.mozilla-thunderbird/XXX.default/user.js

(USER_NAME in this path will be your user name, XXX will be random letters and numbers). The following example shows how to change the browser to Mozilla Firefox (i.e. if it was set to something else like Konqueror) and assumes the executable for Firefox is on the path and can be run by the command "mozilla-firefox", this can be replaced by the executable for other browsers if required. Add the following to the bottom of the "user.js" file making sure that when you do this both Firefox and Thunderbird are closed:

 user_pref("network.protocol-handler.app.http","mozilla-firefox");
 user_pref("network.protocol-handler.app.https","mozilla-firefox");
 

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Opera - turning off the annoying tray icon

Opera 9 by default starts up by placing an annoying, pretty much useless icon in your system tray. To stop it from doing this, add the option "-notrayicon" to the script starting it up. This file is usually found in

/usr/bin/opera

and change the last line of this file to

exec "${OPERA_BINARYDIR}opera" "$@" -notrayicon

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