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I set up an App Tab for my Yahoo email. when I close Firefox the App Tab is not there -- (The instructions on setting up said: All of the App Tabs you have set when you close Firefox will open as App Tabs when you start Firefox again).

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The App Tab shows when I right click on the tab and click pin as app tab, but when I close Firefox and re-open it, the pinned App Tab does not show up. Why?

The App Tab shows when I right click on the tab and click pin as app tab, but when I close Firefox and re-open it, the pinned App Tab does not show up. Why?

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I had this problem after I installed an update for Java. Firefox also stopped remembering my open tabs from last time. I disabled all of the Java plug-ins, restarted, and it's worked great ever since. Haven't missed Java yet either.