firefox support

[DetachHead]

issues for firefox support were raised several times but closed without an explanation (#82 #182 #237), so i'm attempting to do it myself.

this is probably far from done, if anybody has any suggestions for resolving any of these issues that would be very much appreciated:

• [ ] i reverted the extension back to manifest v2 for now, since firefox does not yet support service workers on manifest v3: Loading extension 'null': Reading manifest: Error processing background: background.service_worker is currently disabled
• [ ] firefox's implementation of chrome.devtools.inspectedWindow.eval does not yet support useContentScriptContext, so the code in app/scripts/devtools/panel/initialize.js doesn't work. any workarounds?
• [ ] the UI5 tab just shows a blank screen, no idea why. i couldn't see any errors in the console that seemed related:

[jdichev]

Hello @DetachHead,

We discussed this in the team and unfortunately we cannot accept this pull request. There are multiple reasons.

First it downgrades the manifest version from 3 to 2 which basically a requirement in order for us to be able to publish on Chrome Web Store which is our only marketplace at the moment.

Secondly, Firefox Web Store is within our future plans due to complications in the compatibility. We are currently looking into publishing on Edge Web Store.

If Firefox is a must in your use case, I would encourage you for now to use your own fork and perhaps in the future we will manage to add the extension to the Firefox store.

Sorry but thanks and best regards, Jordan