Sorry you are face this problem. Setting the timeout at 800ms was indeed idiotic on my part. But at this point, I am wary of both – removing the feature entirely, or messing with the defaults, for fear of breaking the add-on for others.

Meanwhile, can you see if increasing the timeout to an impossibly long value resolves your issue? That should effectively disable the feature. But if you encountered the problem that

> The problem? Before long, perhaps with any Firefox update, this behavior has been turned on again, no matter how many times I have turned it off before.

then I think the impossibly long timeout time will also get reset.

I will look into fixing this issue as soon as time permits me.

Meanwhile, I will try to push out an update with a longer default timeout.

Could you be more specific?

From what I understand, you seem to be missing the add-on icon in the firefox toolbar strip.

But that feature hasn't been removed. So the icon should still be there.

It may have been hidden automatically if the toolbar strip got too crowded.

In that case, look for an icon that looks like a jigsaw puzzle tile. Click on it to see the hidden extension icons.

If this is not the case, could you open an issue at the support site (https://github.com/jyshb/pin-unpin-tab/issues) with more details, or could you email me? You can find the contact email on the extension page as 'Support Email' or something similar.