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how to get rid of a "Recent activity" page that has tagged onto another page
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选择的解决方案
In Firefox, “Recent activity” is usually part of the New Tab / Home page. To remove it:
Open a new tab in Firefox. Click the gear icon in the top-right of the page. Turn off Recent activity.
Or through settings:
Click the ☰ menu → Settings. Go to Home. Under Firefox Home Content, uncheck Recent activity.