Finally! Rated 4 out of 5 stars
Finally I can read pdf-s inside my Firefox. For a very long time, I hadn't been able to see pdfs, probably due to some misunderstanding with Okular or something. Never bothered to check what's the reason (ok, me lazy) and I used Konqueror to read them. Now I can do it also in FF. :)
So far I've opened only 3 pdfs, but they worked great, opened quite quickly and the rendering is absolutely ok - all the figures and formulas look correctly. Text-select also works, but figure-select - no, so I suggest you try to implement that as well. Otherwise it's quite cool. 4 stars from me.