Abrowser crashing regularly on Flidas

I've been having persistent problems with Abrowser crashing. It's been going on for a few weeks, maybe even a couple of months, through a number of Abrowser updates. I'm having a similar problem with Fennec F-Droid in my ancient Android, so I figure it's a general Firefox problem, rather than specifically an Abrowser problem. I'm also having problems on both browsers with some websites like Loomio that run heavy client-side JS, not loading properly unless I open them in a private window. This may be related or it may be a separate problem.

Does anyone has any suggestions on what I could try? Either to fix these problems or to help the developers isolate the source of the bugs causing them.