So add-on's been freezing Firefox for a month now. I disabled Honey and the problem's stopped.. I just disabled a day ago, so still need more time to be sure this was the culprit.

Firefox would slow to a crawl. Or not load sites, even google search. Memory would show as using 97-98%.

Even shutting down FF and restarting wouldn't fix it. Eventually FF'd crash. Then it'd work correctly for a little while. A few mins or an hour.

Running with add-ons disabled worked. So I remembered I added honey last and not too long ago. Disabled it.

So far disablying Honey has fixed my FF problem. I'm not seeing similar comments from other reviewers. Running Windows 10, on 2 year old machine with 16MBs of RAM memory.