I have no clue if that's the case hence I am not blaming only the browser or only the extensions. It's most likely a combination of both.

But the fact remains that I installed 100% the same set of extensions on Chrome and it loads pages at least 2X faster.

I might be a programmer, I might care about putting a rod in Google's giant personal-info-gathering machine, and all that good stuff that makes us feel we're making a difference in the world -- but when 1/3 of all my pages load more slowly in Firefox, I can tolerate this only for so long.

So I don't really know which factor is the real page load speed detractor. I just wish the Firefox team fixes it.