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I installed Numerous.ai third-party Add-On for Google Sheets (CAREFUL - DO NOT INSTALL IT). I didn't like it, so I then deleted it from Add-Ons (Extensions --> Add-Ons --> Manage Add-Ons --> Remove Numerous.ai).

It seemed to install itself as a custom UI menu as well, even though it's uninstalled as an Add-On:

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It's literally not currently installed as an Add-On:

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It also keeps popping up the install menu, prompting me to install it:

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If I cancel, it says there's an error and keeps re-prompting me to install it:

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I've also gone into Apps Script to see if it added its own code, but there's nothing there. I don't get how it's still existing as a custom menu item in Sheets if it's uninstalled??

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This is disrupting my workflow. How can I uninstall this seemingly-malicious third party Add-On from Google Sheets?

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  • With due respect, the "diagnostic" (saying that this was caused by add-on) is wrong as the "add-on" is not shown as a menu rather than an option insided the Extensions menu as it's shown the add-on "GPT for Sheets and Docs" and it's not shown as and installed add-on.
    – Wicket
    Commented Apr 16, 2023 at 7:17

1 Answer 1

Reset to default
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I checked chrome://apps/ and did not see it there. I then tried chrome://extensions/, and it installed itself as an extension as well (I don't recall permitting this).

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I removed the extension and add-on and this resolved the problem.

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  • Congratulations to find yourself that the "problem" was caused by web browser extension instead of an add-on. For the sake of completeness, do you remember the steps that you followed when tested the add-on? It's probably that one of the steps required to install the Chrome extension.
    – Wicket
    Commented Apr 16, 2023 at 7:18

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