Where did you get it from?

Are you talking about Adblock Plus {web link} Blocks annoying video ads on YouTube, Facebook ads, banners and much more. Adblock Plus blocks all annoying ads, and supports websites by not blocking unobtrusive ads by default (configurable).

Adblock Plus Pop-up Addon {web link} Adblock Plus Pop-up Addon extends the blocking functionality of Adblock Plus to those annoying pop-up windows that open on mouse clicks and other user actions.

Forum; Adblock Plus Homepage {web link}

Each extension has a unique ID. Sometimes it looks like an email address, other times a long strings of letters and numbers. Could you look up that ID on the support information page? Either:

• "3-bar" menu button > "?" button > Troubleshooting Information
• (menu bar) Help > Troubleshooting Information
• type or paste about:support in the address bar and press Enter

Scroll down to the Extensions heading, then find the suspicious extension in the tab and copy/paste its information into a reply. This will help with further investigation, and also help others searching for information about this extension in the future.

If the add-on is from Mozilla's site:

If you have a question about an Editor's review of an add-on or want to report a policy violation, please email amo-editors@mozilla.org. Almost all add-on reports fall under this category. Please be sure to include a link to the add-on in question and a detailed description of your question or comment.

Source: https://developer.mozilla.org/Add-ons/AMO/Policy/Contact

Can you post your extension list?

• https://support.mozilla.org/kb/Using+the+Troubleshooting+Information+page