I would not recommend installing addons you downloaded off the internet. Install via the add-on store.
this post was submitted on 29 Feb 2024
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Ah, maybe the whole context wasn't added here, but I tried to download an XPI file for a different program that uses Firefox under the hood (called Zotero). I wanted to download the file to install it manually for the other program.
Firefox naturally thought that the XPI file was meant for itself and tried to install it. The XPI file was never intended for Firefox.
Edited to add: probably a pretty obscure thing that I noticed, but it's still bizarre.