This extension allows Sunbird and Lightning to read and write events to a Google Calendar. Provider for Google Calendar :: Sunbird Add-ons
What this means, is that since I don't maintain a paper calendar, and I pretty much use Google Calendar as my calendar, I've been trying to figure out a way to have a desktop version of the calendar. since I keep my calendar separate from my email client.
With the above extension, I can now add entries to either the Sunbird calendar, or the Google Calendar, and they both end up making changes in the same place!
About:config entries - MozillaZine Knowledge Base This article explains what the different options are that you can control via about:config inside a Mozilla/Firefox browser.
Filtering by password can be useful if your Master Password is messed up.
Mozilla Password Viewing -- this page will let you download a JS script that, if you save locally and run, will display for you all of your usernames and passwords. This could come in handly when switching machines, etc.
There are a few special URLs, which begin with about:, that you can type into the Location Bar: About protocol links - MozillaZine Knowledge Base