This Article is based from data that we get from the most used extension and positive review from netizen. We are aware that there will be differences of opinion with many people, this is our Most Popular Ads Block Extension for Firefox.
most popular ads block extension for firefox
uBlock Origin

in our first list have the most downloaded Ads Block extension for Firefox.
uBlock Origin is a free and open-source browser extension for content filtering, including ad blocking. The extension is available for :
Chrome, Chromium, Edge, Firefox, Opera, Pale Moon, as well as versions of Safari prior to 13.
Initial release date: June 23, 2014
uBlock Origin is one of the gold standards in ad blocking. Not only an elite ad blocker that stops nearly every type of ad by default. Including video and pop-ups uBlock Origin is lightweight, so it doesn’t consume much CPU and memory.
Rated 4.8 out of 5
Users: 6,107,856
Ghostery

Second place is Ghostery Using Firefox’s Fenix, Ghostery Privacy Browser offers comprehensive features that enhance user privacy for mobile browsing. Ghostery Privacy Browser integrates the powerful ad blocking and tracker protection of the Ghostery 8 control panel with improved web browser functionalities. We’ve cut out extra bloating for you – so all you need to think about is which site you want to visit next.
Rated 4.3 out of 5
Users: 1,137,266
AdBlock

Next we have AdBlock with AdBlock, you can block all types of ads by default, but it also lets users opt in to Acceptable Ads by choice. Acceptable Ads is an independent vetting program where advertisers can participate to have their ads pass through content filters if they meet certain criteria. Llike only allowing display ads that fit within strict size parameters, or text ads that adhere to tight aesthetic restrictions.
Free tier of Adblock works great, but indeed some of your favorite features you must pay, like device syncing and the ability to replace ads with custom pics of animals. Or when you want ad blocking with a privacy boost.
Rated 4.3 out of 5
Users: 1,097,630
AdGuard AdBlocker

4th position is Adguard Adblocker
AdGuard AdBlocker is Highly effective ad blocker and anti-tracker that even works well on Facebook and YouTube. AdGuard also smartly allows certain types of ads by default—like search ads (since you might be looking for a specific product or service) and “self promotion” ads (e.g. special deals on site-specific shopping platforms like “50% off today only!” sales, etc.)
This extension goes to great lengths to not only block the ads you don’t want, but the trackers trying to profile you. It automatically knows to block more than two million malicious websites and has one of the largest tracking filters in the game.
Rated 4.7 out of 5
Users: 853,744
AdBlock for YouTube

Fifth is adBlocker for YouTube
Adblock for Youtube is a content filtering and ad blocking browser extension which blocks all ads on Youtube.
It allows users to prevent page elements, such as advertisements, from being displayed.
Banner, Ad-Clips or even preroll ads you usually see before the actual video on Youtube are blocked by this extension.
It Blocks ads, banner and popups
Also Blocking of ads on external sites which load Youtube
Rated 4.2 out of 5
Users: 477,385
Popup Blocker (strict)

Next is Popup Blocker. Strictly block all popup requests from any website
It is common for streaming, shopping, and WordPress sites to open unwanted pop-ups or redirect users to ad pages.
This free, open-source Chrome extension blocks all types of popups and popunders before they are issued.
It pauses window opening requests for user attention.
Unlike other popup and ad blocker extensions, this one blocks requests on the original page rather than closing the target pages.
Rated 4.2 out of 5
Users: 51,643
Webmail Ad Blocker

And then is Webmail AdBlocker.
When you have other ads problem, like in email. you have to use Webmail Ad Blocker. Or Tired of ads thrown in your face when all you want to do is check email?
Remove advertising clutter from your web-based email. Expand your viewable area by blocking and removing ads on the right-hand side of the screen when using Gmail, Hotmail, Outlook.com and Yahoo Mail.
Remove ads and get more breathing room in and around your inbox. Webmail Ad Blocker not only blocks all the box ads crowding the edges of your webmail, it also obliterates those sneaky ads that appear as unread messages.
Rated 4.5 out of 5
Users: 28,755