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Firefox - Bookmarks and history system

I have received this message: - The bookmarks and history system will not be functional because one of Firefox's files is in use by another application. Some security s… (kàsi)

I have received this message: -

The bookmarks and history system will not be functional because one of Firefox's files is in use by another application. Some security software can cause this problem.

I clicked the blue print for help to solve it and I gather the first instruction is to restart Firefox.

I have no idea what that means - Do I click the wee cross top right to close it and then click the Firefox wee sign to open it again. I tried that but get the message.

Asked by elizabethcolquhoun27 18 àwọn wákàtí sẹ́hìn