The small and difficult to read fonts in Firefox 3: here is how to fix this:

Go to about:config in Firefox. To do so type about:config in the address bar.
Navigate to layout.css.dpi by typing layout in the filter bar.
Double click it and set to 0. By default it is -1
Restart Firefox.
Done.

Now all the options under [...]

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To invoke Firefox from Thunderbird under Linux you need to add these to user.js in thunderbird’s directory (adjust to your Firefox executable):
user.js

// invoke Firefox as web browser
user_pref(”network.protocol-handler.app.http”, “/usr/local/bin/firefox”);
user_pref(”network.protocol-handler.app.https”, “/usr/local/bin/firefox”);
user_pref(”network.protocol-handler.app.ftp”, “/usr/local/bin/firefox”);

PLEASE NOTE: Do not add them to prefs.js because it is overwriten by mozilla. user.js contains personal preferences and mozilla should never overwrite it.
By default [...]

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Firefox at times pops up a dialog box, containing the message:
A script on this page may be busy, or it may have stopped responding. You can stop the script now, or continue to see if the script will complete.
The primary intention is to avoid infinite loops or something similar. However, if you see this message [...]

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