Greasemonkey compatibility

[kellnerd]

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The voice actor userscript does not work with GM because it requires access to the MB global. Also, the script still contains a few jQuery references which had also broken the punctuation userscript in GM.

I should replace all remaining usages of jQuery and create a utility function to access MB and check all existing scripts again to see if they are working with GM then.

• [x] Replace jQuery with native DOM utilities
• [ ] Provide save access to MB and other global MBS variables (GM context)

[kellnerd]

No more jQuery in any of my userscripts as of today 🎉

[kellnerd]

This link from https://github.com/kellnerd/musicbrainz-scripts/issues/33#issuecomment-1373007877 might still be relevant here:

I should finally look into Sharing objects with page scripts