Username or EmailPassword
Most FF extensions do not need to be written in C++. JS, XUL are enough to define an extension. Even an advanced one!
So many extensions with almost no adaptation works through multiple versions of OSs and Firefoxes.
Do someone know if Chrome have support of suchlike framework? And there is support for ABP or equivalent in it? (the main reason I was stand away from Chrome as the net works much faster)
JS is the preffered (and now I think only) extension language. Graphical elements are constructed with HTML. They have a python script for creating a package (like a zip file they say, haven't played with it) for all the files in your extension.
I hacked together (post above) an adblock extension, but necessary functionality like pattern matching still seems buggy.