Excellent extension, but problems with GMail, started late Feb/22.

The mobile version is basically useless. All settings for blocking google, facebook, website video's, popups, tracking, etc., DISAPPEAR (as in gone) next time I start the Firefox mobile browser.

Now the customized settings disappear on the desktop version as well. The developer update has ruined this app.

Increasingly ineffective, especially in terms of blocking Google ads.

2-5-25: hasn't iimproved still slow to load. same as last review
8-31-24: degraded one start. TOO SLOW. Doesn't work with some pages. SLOW to load, slow to capture, just plain SLOW. Takes forever to delete segmented ads you wind up spending all your time blocking each segment. Have recently had to reinstall never had to do that before. No way to easily report pages that don't work.
7-29-24: cannot deal with pages such as gab.com that keep changing the address of the same add. You have to keep blocking it over and over again and editing the script does no good. Too slow to load sometimes cannot load it.Sometimes too hard to select the portion you want deleted. It's still good but not as good as it used to be.


10-20-23: getting slower to load or won't load or won't show gui to delete ads. can't capture some site's ads. no way to delete all the little social widgets at the same time. just getting TOO damn slow
3-17-23: Still the best addon on the net. But always room for improvement. Slow to respond often. Doesn't work on little social media widgets because you spend more time blocking each one than it's worth: fb,and others. No way to easily report pages where it does not work. Slow to mark offending jpgs and slow to load and block them. Still a very good addon, indispensable.
12-17-22: So far I see no way to block these little social media widgits which you have to delete one by one and this takes forever. Many sites incorporate their garbage into the main page and it's difficult if not impossible to get rid of it. In short it works like 95% of the time and for 5% you have to put up with website garbage. No easy way within the program to report sites and bugs.
7-20-22: no easy way to report pages that block it's use. Some pages it will not work. Often slow to bring up the block window.
9-16-21: Still great. On some sites when you try to use the eyedropper, the popup for the script to delete the ad does not appear or appears and then immediately disappears or does not appear at all. Making it difficult to select the script that needs to be blocked. Still a great addon though.

If you don't have ublock origin, you should get it. Best add on on the market. Extremely useful in eliminating the garbage idiot admined websites throw your way. Has a learning curve but not bad. Kudos to the developer for this program, wish they'd design a web browser too. Great.

An ad popped up on youtube before a song. That is very strange indeed. Seems this extension does not work like it should.

Update your certificates already! Tired of getting a pop up from Bitdefender that it blocked a connection to github.xyz every time I use the web. Extremely frustrating!

7-10-25: cannot deal with this little square social media widgets-takes too much time to delete them. Slow to load
author needs to find a way to IDENTIFY WHICH block to use for any given crap ad. It's too slow. Need a method to select all adds you want to block at once. Except that it's slow good addon

3-27-25: too damn slow.
aug. 2024: Getting worse by the minute: slow to load slow to mark offending images, many sites are immune or very difficult to block. Not as good as it once was. Sites have gotten clever in making it not work or making it more work to block them than is worth it. It's slow to load and filters slow to activate. Still no easy way to report sites that do not work with it. You have to block like 10 different widgets to get rid of one on social media sites. To hard to block multiple ads at one time.
5-19-24: has deteriorated in last year or so. SLOW to load, Slow to delete ads you have defined. Sites are working around it making it not worth the time to delete the ads using it. Still have not found a better one, so can't complain too much
1-28-24; All good things eventually deteriorate and ublock origin is no exception. too slow to respond to browser callups, cannot deal with ads that repeat and keep changing, no easy way to report pages that don't work SLOWWWW. Downgraded to 2 stars
1-5-24 -really starting to get SLOWWW and a PITA. Difficulty marking items you want nuked. Wasn't able to get it to work with disk files, only online. You can tell some of the websites are desiging their pages such that ublock doesn't work or works inefficiently requiring more time to get rid of their garbage than is worth it. Popup slow to appear. Still a good extension but has gotten worse not better.
9-22: one of the VERY FEW addons that actually works and is not a PITA. Congratulations there ARE some good programmers out there.
10-3-21: near perfect with a few minor flaws: ran across tiny social widgets that cannot be nuked. Try to nuke them with either lightning or pen, works for one time only than come back again. webpages are getting smarter in how to stop u block. Also cannot find a link in the extension to send input to developers whereas before there was such a link to report instances where the program did not work.

One of the VERY FEW addons that is really good and works well. Easy to block objectionable images on webpages so as to deny them ad revenue, like with sites that mistreat users. Only criticism I have is that when using an encrypted connection like with a vpn or tor, the settings do not stay and you have to reset the blocks. I'm guessing its because the ips and other stuff changes with tor so cannot make the blocks permanent. Great extension over all. Look for other add-ons by this author they will be good.

I have issues with uBlock on Apple Silicon Firefox. It doesn't block anything, and usually when you open the uBlock menu nothing appears. Occasionally, an extension (possibly not uBlock) crashes Firefox.

thanks for hibernating uMatrix in favor of uBO which is harder to use and offers less granularity

these 2 projects should never have been split

Ive been using this extension for years. Now suddenly i am seeing add after add on Youtube. Why is that dear developers? Are you aware of the problem?

Судя по всему начали интегрировать кривую рекламу, белые окна на ютубе которые приходится скипать...

Does not work for Twitch at the moment, kind of a bummer since it's the site I visit the most.