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Why are my tabs disappearing?

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I have Firefox 9.0.1 and have multiple tabs open. Sometimes when I click on one of the tabs, it disappears from that window and opens up in a new window. It happens with both regular tabs and those that are pinned as app tabs. I've been running this same configuration for quite a long time and made no additions or changes before this started. This is running on Windows 7 32bit SP1. Any advice? Thanks

I have Firefox 9.0.1 and have multiple tabs open. Sometimes when I click on one of the tabs, it disappears from that window and opens up in a new window. It happens with both regular tabs and those that are pinned as app tabs. I've been running this same configuration for quite a long time and made no additions or changes before this started. This is running on Windows 7 32bit SP1. Any advice? Thanks

Chosen solution

Probably the tear-off tabs feature.

Try this add-on to disable that feature.

https://addons.mozilla.org/en-US/firefox/addon/bug489729-disable-detach-and-t/
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Chosen Solution

Probably the tear-off tabs feature.

Try this add-on to disable that feature.

https://addons.mozilla.org/en-US/firefox/addon/bug489729-disable-detach-and-t/