at top above the aos screen you will see the address bars... at far right you should see 3 parallel white bars .. a single click should open a menu where you will find add ons(I take it your on firefox_
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The ad inviting me to compare bras looks interesting though...
some issues they are black lines...
https://techdows.com/wp-content/uplo...refox-Menu.png
add ons should be under library one
Just logged in on an up to date Linux machine with Firefox 62.0.3 (64bit) and adblock plus, no strange adverts.
Slimjet is good, built in adblocker.
https://www.slimjet.com/
I get no ads at all on any site, unless I've unblocked them. But I use an alternative browser.
There are other adblocker downloads available for Firefox, like StopAd.