I don't know about you, but the latest Firefox is not working like the previous versions use too. I am running Firefox 39.0 on Windows 7 and it crashed on me few times. If not, it crawls down or completely blacks out so much that I find myself having to restart FireFox every 15 minutes. Well, I found out that it is LEAKING MEMORY really really really really reallllllllllllllllllllllllllllllY BAD. It leaks memory when running idle without going to any website for GOD SAKE. So, I went online for solution and many people have said that they are not having any problem. And then, there are those who are having problem just like me. It turns out that this memory leak has something to do with FireFox Addons.
So, I disabled all the addons on my FireFox. It has helped a lot, but it still crashes or blacks out only that it takes longer.
When I run Firefox 39.0 with all the addons enabled, its crashes with memory at somewhere 1.5GB. And without any addons enabled, it crashes with memory at somewhere 500MB.
What is going on FireFox? Oh well, I guess good things can't last forever.