Re: Taco can't be removed from 17.0.1 Constant "Abine initialization error" pop-ups.
It seems my message was not clear.
I wrote: "Tools Add-ons Taco Disable, followed by Remove gets the grey bar with the text saying that Taco has been removed. Exiting and restarting Firefox repeats the behavior above. "
What I was trying to write is exactly the same as your steps 1 to 5.
(OK, I should have included Extensions, and written: Tools Add-ons Extensions Taco Disable, followed by Remove. The tab always opens for me with Extensions already selected, since that is where I was the last time I opened the tab to do something with an extension.)
Let me try this way:
I choose Tools from the Firefox menu, then Add-ons, Extensions, and Taco. I click Disable. Then I click Remove. Firefox says "Taco with Abine has been removed"
>>> Exiting and restarting Firefox repeats the behavior above.
If you see disabled, not compatible, extensions in "Tools > Add-ons > Extensions" then click the Tools button at the left side of the Search Bar (or click the "Find Updates" button in older Firefox versions) to check if there is a compatibility update available.
If this hasn't helped then also try to delete the addons.sqlite file.
If you do not keep options or pref changes after a restart then see: