To people helping others on the internet who claim to be security professionals, remember to make sure that the person is actually trustworthy, so you're not helping criminals. Even though a_cherepanov is a new account with only this comment, I suppose their email domain makes them trustworthy enough: ESET is a Slovakian security company that's had a Wikipedia page for 5+ years.
Hi fukusa, I know a Russian website (not a news site, it is webdev oriented) that triggers some PDF error in Firefox 35 and does not do that with latest Firefox 39.0.3. I sent a bug report to owners 6 days ago (just because PDF errors on a webpage are strange) and they have not fixed it yet. Could you check this website? I can send you an URL the way you prefer.
