I'm running Mac Firefox ESR 52.3.0. I had many "cosmetic" custom filters created in UBlock Origin (in "the dashboard"), which were working fine. They represented hours of my work in cleaning up many websites that I visit regularly.

The update to UBO 1.14.4 completely deleted all my filters without warning! I couldn't figure out which exact file they were in so I had to restore my entire FF profile from backup.

After I got my filters back... they didn't work very well. About half of my custom filters were ignored; or they'd work when first created, but as soon as that web page reloaded, they were ignored.

On UBO's github page, I discovered that this problem was discovered, discussed, and a new bugfix version posted: 1.14.8. However Firefox warned me not to install it from github because it wasn't "verified." I installed it anyway and the problem seems to have been fixed.