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.

A total desaster for 4-5 weeks. Slows down websites to oblivion and often prevents loading websites at all.
Like the Epic Store, CWTV, Joyn and other websites won't load anymore, when using this PoSoftware and browsing the website for the second time. What a bummer. Was quite a good add-on, now its useless since it messes around with the usability after all.

i only give 1 star because of uBlock Origin blocks both Support site and home page. this makes me lel it makes me think about reinstall this Extension

after this all web pages stopped to load, nice way to block adds by blocking all contents

It really slowed down opening up Firefox, I had to wait 3-5 minutes for any page to open. Deleting it stopped the problem so definitely something related to uBlock.

This addon has caused nothing but problems for me across many websites. Adobe's website doesn't show prices, a photo downloader wouldn't retrieve the file, a Microsoft Sharepoint site wouldn't load any of the files, and other problems with Samsung, some forums and even Google. All solved by disabling the addon. I'm doing SO MUCH disabling that it's not even worth having it. I've never had these problems with AdBlock Plus. UGH!!!

EDIT: Also just found out it was this plugin responsible for making Paypal give me errors where it was impossible to pay. Worked as soon as I disabled this. This is with no custom filters. Madness. Definitely removing now.

Crashes mobile Firefox every time, so I had to remove it.

Basically no difference someone recommended ublock to me but it is useless I'm going to go back to what I had before.

Still getting ads with this.

Через некоторое время работы поле последнего успешного запуска браузера блокирует интернет вообще. Помогает только удаление и переустановка дополнения

This extension was great until it blocked REST requests that simply had *adverts* in their name and not saying anything about it in the console.

eating too much memory..! checked in firefox

I love this extension on my PC, but here on Firefox mobile it seems to have a problem where it consistently causes pages to fail loading. Only thing that fixes it is restarting the browser and it happens often enough that it's a real hassle.

Horrid app. What did you people do? Takes literally 50 to 60 seconds just to open the firefox browser to google.com and every web site as well. I haven't seen a computer run this slow since dial up 1998. Oh and Peter Lowe’s Ad server list blocks google shopping and ebay???WTH!!!