If you have the awesome AdBlock Plus Firefox extension installed, you may have noticed this unfortunate UI feature, which lets you block annoying Flash or Java with a click (since they have their own right-click context menu), but makes pages look like shit:

The documentation refers to various settings for AdBlock Plus, in addition to the whitelist/blacklist rules, but I don't see this on my Mac.

So here's how you solve the problem:

Type about:config into your browser's address bar.

In the top input, labeled "Filter:", type "adblock".

Look for the entry called "extensions.adblockplus.frameobjects" (below) and double-click it:

It should now be boldface, and set to user set / boolean / false instead of default / boolean / true.

Voila! No more ugly, grey tabs.

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