Had no problems since months with uBlock origin, great Addon. But since 3-4 days and version 1.16.10 it slows down my firefox completely! CPU use with 50-70 %. Everthing freezes. Youtube sites are not longer usable. I had to deactivate the Addon. And I can see, I am not the only one who has these problems. No reaction here from the authors! I use firefox ESR 52.9.0 (32-Bit) on Ubuntu Studio / Xfce.
Also version 1.16.12 does not solve the thing. So, please fix these problems fast! I need my adblocker. ;) Thanks!

P.S. It was also not possible to update the filters. I tried several times, but no reaction, just "turning circles" symbols.