Copying element html&css extensions don’t work on Firefox

I sometimes need to copy html and css from a specific element and I found a few extensions for that : SnappySnippet: []( and eXtract Sinppet from google chrome. As you probably know the inspect element feature in Firefox is much better so I tried to install these add ons there but this is what I get: This add-on could not be installed because it appears to be corrupt.

[The error that I get](

I tried several methods that I found on the internet like creating a new Chrome file in the Firefox profile folder which contains: userchrome.css, userchrome.xml, and disable-add-on-signing.js, or changing numerous values in about:config. However, nothing works.

Do you know any method that I can get the SnappySnippet add-on to work or how can I use the google chrome extension in Firefox?

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