Mozilla/Firefox

• firefox and thunderbird build doc
• thunderbird help
• An unability to save/download files, without any visible error, is probably caused by corrupted downloads.rdf. Remove it.
• how to enable emacs keybindings
• A lot of configuration options are reachable through about:config URL.
• To enable telnet URL, add network.protocol-handler.expose.telnet = false to configuration (for example, creating a new boolean entry in "about:config") and use this script as a handler.

Netscape