Re:XUL Layout has been removed from Firefox
by mikae1 on Sunday April 02, 2023 @07:00AM
(#35409260)
Vimperator was abandoned when XUL add-ons were abandoned, presumably because they couldn't pull it off with WebExtensions.
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Partially, the reasoning they gave back then was it was too tightly integrated with Firefox's internals. Even if WebExtensions had all the APIs needed, it would have needed nearly a complete rewrite and they weren't up to it.