Oer dizze útwreiding

This is a simplified respin of the TabSubmit extension (which in turn is a rewrite of the SubmitToTab extension) done as a webextension for better forwards compatibility.

Because webextensions aren't able to modify the Firefox preferences it's unable to guarantee consistent behaviour when middle-clicking or ctrl/meta+left-clicking on a submit button.

Wurdearje jo ûnderfining

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