I think I see where it is from your system details:

orange Firefox button (or Tools menu) > Add-ons > Extensions category

If there is no Remove button, then it is an externally added extension and you may need to visit the Windows Control Panel to get rid of it. (But go ahead and at least disable it now.)

Does that work?

That worked! I can't thank you enough. Never would have found that on my own. Problem totally solved.

Thank you for installing the Troubleshooting extension that gathered that information. In the old days, we would be asking you to poke around on your own and this made it much easier to resolve it quickly.

I have also been getting these unwanted ads. I went to "Add-ons manager" in Firefox where I found about ten add-ons. First I disabled all of the add-ons, and went to a page where the ads had appeared; The ads were now gone. Next, I enabled each add-on, one at a time, until the ads re-appeared on that page. I assumed that this last add-on was the culprit. I alternately disabled and enabled this add-on to verify that it was the only one that caused the ads to appear. The only add-on that caused the ads to appear in my Firefox browser ver. 22.0 was "Shockwave Flash ver. 11.7.700.224".

Hi franklr, many sites use Flash both for actual content as well as ads. It's hard to use much of the web if you have the Shockwave Flash plugin disabled.

In case there is an extension involved, did you also check this list:

orange Firefox button (or Tools menu) > Add-ons > Extensions category

Thanks for the suggestion. I had only checked for ads that appeared in news articles on BBC.com. I re-enabled Shock Wave flash, went to extensions and "disabled" all of them that gave me the option. The ads returned. I guess I'll just keep Flash disabled until I run up against an application that needs it.

-franklr

I tried the extension link from Toolbar and disabled one extension found there. Then I went to a website where these ads/boxes have been appearing and sure enough...there they are. they make one absolutely batty and I'm desperate to be rid of them! I'm going to try to post a screen shot of them. Red boxes are mine added in photo editing software. Disabling Shock wave flash did nothing to eliminate these irritating boxes.

Hi bettywest, you only have one extension -- or you only felt comfortable disabling one of them?

Could you also try Firefox's Safe Mode? That's a standard diagnostic tool to bypass interference by extensions (and some custom settings). More info: Diagnose Firefox issues using Troubleshoot Mode.

You can restart Firefox in Safe Mode using

Help > Restart with Add-ons Disabled

In the dialog, click "Start in Safe Mode" (not Reset)

Any difference?

Can you check that your proxy settings have not been changed? You can view those here:

(WIN) orange Firefox button (or Tools menu) > Options > Advanced
(MAC) Firefox menu > Preferences > Advanced

On the Network mini-tab, click the "Settings" button. If it's not currently set on No Proxy, try that.

I have the same problem and has been trying to block it, and it slows down my browsing.

Hi encycster, did you try Firefox's Safe Mode as described in an earlier post?

Jscher, I tried to do the other thing, initially the ads vanished, but as I tried to reopen the browser, these ads are really giving me frustrations. it slowed down my surfing time.

safe mode not yet, because safe mode also has other problems. i cannot risk my laptop to do that as my software

Not Windows Safe Mode is meant, but Firefox Safe Mode.

Firefox Safe Mode is meant for troubleshooting purposes and disables all extensions and disables a few other features as well.

• https://support.mozilla.org/kb/Troubleshooting+extensions+and+themes

This won't affect your computer.

You can use one of these to start Firefox in Safe Mode:

• On Windows, hold down the Shift key while starting Firefox with a double-click on the Firefox desktop shortcut
• On Mac, hold down the Options key while starting Firefox
• Help > Restart with Add-ons Disabled

• https://support.mozilla.org/kb/Safe+Mode