This extension allows you to run LaTeX on your computer to automatically generate images for all expression $expr$ found while composing your email. You can also render possibly more complex sets of LaTeX, and have them inserted as images. You can undo the LaTeX run if the formulae you inserted were wrongly typeset, and you can customize the appearance of your formulae.
Since everything is run on your own computer, you're in control!
This extension is provided as a set of files. Please run make to build a working xpi. Alternatively, you can create a file named "firstname.lastname@example.org" in your extensions/ directory with a single line containing the path to this folder.