User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:82.0) Gecko/20100101 Firefox/82.0

Steps to reproduce:

after deleting the history and cache on Windows10 64 bit PRO
I use Clear all and all the times (leaving blank only "site preference"
The history isnt cleared on th right click menu over the Firefox icon in the Windows footer taskbar.

Actual results:

This cause to view the history and searches after the delete history is performed.
Huge issue over privacy

Expected results:

no history to display on right click on Firefox icon after delete history performed

There is no benefit to keeping this bug hidden as it cannot be exploited by remote attackers, only by people with access to your machine (in which case you have bigger issues), and it's probably worth people being aware this issue exists rather than keeping it confidential, so I'm going to unhide it.

As a workaround, you can use the prefs under browser.taskbar.lists to disable these lists altogether.

The severity field is not set for this bug.
:johannh, could you have a look please?

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