At some sites most of ads wasn't blocked

If the blocker is turned on and i open my browser, i cant use any website, it will load forever! If browser is opened and i restart the blocker, only then it works fine , as it should be.

Sadly this single addon uses 32 GiB of virtual memory on Linux systems. This results in a completly lagging/freezing PC when just running Firefox. Got worse since I use Sophos AV which does on-access file scanning. Because I will not disable on-access scanning due to security reasons, I got to disable the addon. After using uBlock Origin for a long time I now switch back again to uMatrix as this addon does not use any extraordinary amount of space. I am running 20-30 security addons in conjunction and pinned point that NON of ALL the other ones has this behaviour. Please fix the background system of how the extension works. To see WORKING Addons see my profile.

ad blocking not working in YouTube.

This a very frustrating pop up blocker. It either blocks ALL or none. Most pop up blockers show a bar on the screen asking you if you want to allow a popup and you can select no, one time only, or always. ublock origin doesn't do this and it is very frustrating because there are times you definitely DO want to allow pop ups.