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How to I prevent Firefox from opening a second tab all the time when it starts?

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When Firefox opens, it immediately opens a second tab that goes to "https://www.mozilla.com/en-US/plugincheck/" My home page, which is Google, is on the first tab. How can I stop this from happening, it never did this before? This just started today.

When Firefox opens, it immediately opens a second tab that goes to "https://www.mozilla.com/en-US/plugincheck/" My home page, which is Google, is on the first tab. How can I stop this from happening, it never did this before? This just started today.

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See these articles for some suggestions:

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I tried all 3 of your suggestions and I still have this problem. I still need help resolving this issue.

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This issue was caused by a bug to blocklist plugins and that has been fixed.
You can correct this issue by forcing the file blocklist.xml to update or wait until Firefox updates the blocklist.xml file during the next hours.
That update will remove the severity="0" flags in the file that had caused the problem.

See: