Automatically search for text string- set accessibility.typeaheadfind to true (or Edit -> Preferences -> Advanced -> Accessibility -> Begin finding when you begin typing)
Thunderbird
Getting Thunderbird to use Firefox for links in messages
Stop Thunderbird.
Find your Thunderbird profile directory (it will be something like /home/vunetid/.mozilla-thunderbird/d2dn4kj6.default/) and cd to that location
Create or edit the file "user.js" to contain the following two lines: