Go to the Mozilla Add-ons Web Page {web Link} (There’s a lot of good stuff here) and search for a good ad blocker.

Hello raghuramk,

If you want to unblock pop-ups, like you say in the header of your post, please go to the 3-bar menu (or Tools) => Options/Preferences => Privacy & Security => Permissions and uncheck the box next to "Block pop-up windows"

However, your system details show that you posted this with an Android device - please see :

https://www.lifewire.com/disable-popup-blocker-firefox-1259171

(you'll have to scroll down some)

Raghuramk said

how to unblock

Oops, sorry.

Is the problem on a computer or cell? Are you already using a blocker?