I've switched to Firefox but there's definitely a few things that irritate me about it.

First thing is when I boot up my computer, launch Firefox, it launches long enough for me to click a bookmark then closes to perform an update. And then doesn't automatically reopen...

I also have it set to not "remember" my tabs after closing. Yet when I launch Firefox for the first time after rebooting or closing ally tabs, it gives me a "hmm.. we're having a hard time finding your previous session" message. Uh, yeah, I told you not to look for it.. can I just have the regular "new tab" page?

It also might just be because I'm used to chrome, but I feel the mobile app is severely lacking. I hate that I can't access my bookmarks directly from the new tab page, and that the tablet version doesn't show you your bookmark bar. The synchronization between mobile and desktop isn't great either, I'll have a very long specific search query that I've used multiple times on my phone, yet it doesn't offer it for auto-complete on desktop, I have to search the entire term again or go digging through my history. When you're searching long model numbers and the like, this is incredibly frustrating.

Finally, and I don't know if this is a Firefox issue, but there's some memory leak that occurs when viewing a webcam stream from my raspberry pi that only has happened in Firefox. The first time I noticed it happening my PC slowed to a crawl, when task manager finally opened Firefox was taking 23GB of RAM. So I have to use chrome to keep that steam open for more than a few minutes at a time.