Hey gorhill, many thanks for this wonderful addon. However, there are 2 sudden issues I am having and I noticed many threads of a similar nature on reddit and the like:
1) Unfortunately, in the past few months there has been a sudden spike in CPU usage, to the point that my fan is just screaming until I disable uBlock.
I know you get these a lot but please bear with me because it really is very confusing, at least right now.
There is no "specific" reproducible case because it happens all the time, regardless of which website I am on. This issue did not exist 3-4 months ago. I haven't messed around either, besides using the addon as would be normally expected.
2) uBlock doesn't seem to "work" properly anymore. Let's say I am on a forum where people have attached pictures of their wallpapers or anything else using different imagehosts. What happens is that many imagehosts get filtered so I would enable them in the advanced menu. But now those don't work properly; some images still get filtered out (is this because of specific "3rd party filter lists" instead?).
Once I got tired of it, I set "all" as green for the local section of the website. It was working fine, but then it suddenly stopped working. uBlock wouldn't respect it anymore. So finally I tried to see what would happen if I disabled uBlock from within the addon (not disabled from Firefox). It would work and then even that has stopped being respected. It seems like a pattern where first everything works fine for a new site and then once I've visited enough times, it would stop respecting anything. What's so weird is that the addon is disabled from within the addon and it would not matter; things would still get filtered.
The only solution was to completely disable the addon from about:addons. The unfortunate side effect is that all those insane pop ups and things come about that eat up nearly the same amount of processing power.
Hope to hear from you soon! Normally I tend to figure these things out on my own but this is quite baffling. Maybe it's the newer Firefox versions that are causing this? Mine is 51.0.1. Also, I use Privacy Badger, but I haven't noticed any conflicts with uBlock.