events.js uses deprecated method initKeyEvent, disabled by default in Firefox 93

[mtrea]

🐛 Bug Report

Sorry, I'm foregoing the typical report structure since this is a very specific code/api issue.

In javascript/atoms/events.js, there is a call to initKeyEvent here.

According to Mozilla's documentation here, this method is deprecated. Importantly:

Firefox hides this method behind the preference (dom.keyboardevent.init_key_event.enabled) from version 93 and plans to remove it shortly afterwards.

Any code that depends on this file's usage of initKeyEvent is broken by default starting with Firefox 93 (currently in beta). It's unclear when Mozilla will remove the workaround.

[github-actions]

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