Option "Show Closed Tabs" not active - Still closed tabs show up erratically

[Gerald4000]

Hello Darktrojan,

thanks for your firefox addon a lot - i hope you can help with an issue:
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General description of the problem:

I have inactivated the option "show closed tabs", still closed tabs appear in the horizontal list above the tiles.
This phenomenon has shown for some few weeks now, it was not a problem in the many month before.

I thought it might be my firefox profile - so I generated a fresh one.
I freshly installed "new tabs tool" also and also freshly configured it.
I did NOT restore "new tab tools" from a backup - it was a clean configuration from scratch.
Immediately the problem occured again.

I use the german translation of "New tab tools" - so I have to guess the english label for the option "closed tabs".
I hope there is no confusion which option I am talking about.

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Specific description of the problem:

• The described problem occurs erratic, it is not always reproducable.
• This happens when I open several websites from an existing "new tab" by pressing the 3rd mouse button.
• So yes: I always open new tabs in an actual browser's new tab, so the tab of "new tab tools" stays open and is not altered.
• I do not close the tab "new tab tools"
• when I eventually close one or more of just opened tabs, and I then open another "new tab tools" pressing "+", suddenly these closed tabs show up in the horizontal history list of this new "new tab tools".

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My software configuration:

• Windows 10 21h2 (latest updates)
• Firefox 98.xx and 99.0 (I experienced the issue with former firefox versions of the last 4 weeks)
• I have set "new tab tools" also as my start page
• other addons in use: ublock origin, stylus.
• these other addons should not effect "new tab tools", as direct access is surpressed by mozilla security policies