Firefox for Android cannot automatically read clipboard

[jesus2099]

When loading MMR, it reads clipboard to see if there is a release or a medium URL to automatically load.
But Firefox for Android does not allow that.

The work around is to go the the hidden about:config page secret URL chrome://geckoview/content/config.xhtml and to allow dom.events.testing.asyncClipboard.

Problems:

• User does not know when dom.events.testing.asyncClipboard is false: Advise user how to change it to true
  • OK with 1e91941
  • But Firefox for Android "about:config" (chrome://geckoview/content/config.xhtml) link does not work (does not even open tab)
• URL is pasted and visible but remote release loading is not launched, despite the input event dispatched on mergeStatus
  • I don't know if it's because of night mode or this unrelated commit 6a76cd1, but now it works, with either release or medium URL
  • In fact, no, half of the time, the URL (auto-)paste does not trigger the loading. Sometimes, even typing an additional space, manually, still does not trigger the loading!

[jesus2099]

With MobiDevTools¹, I could see this, in the console:

Unhandled rejection: Clipboard read operation is not allowed.

With the default dom.events.testing.asyncClipboard: false, of course.

Unfortunately, try/catch does not trigger! 🤔

¹ And nothing shows up in the console, with Mobile DevTools

[jesus2099]

For the record, when I disable clipboard access for MBS in Vivaldi, the error is:

Uncaught (in promise) NotAllowedError: Failed to execute 'readText' on 'Clipboard': Read permission denied.

Or, if I'm away from the page, looking at the webdev tools, for example:

Uncaught (in promise) NotAllowedError: Failed to execute 'readText' on 'Clipboard': Document is not focused.

None of which is caught by try/catch.

[jesus2099]

OK I just have to use the Promise catch method, to detect clipboard access access denied!

[jesus2099]

I have added help about how to enable clipboard access, for Firefox and Vivaldi.
I don't know why but, on subsequent attempts, MMRdiv is no longer found!? The userscript works correctly, other than that, so I won't spend time trying to figure out.

[jesus2099]

Reopening because:

• The Firefox for Android "about:config" (chrome://geckoview/content/config.xhtml) link does not work (does not even open tab)
• half of the time, the URL (auto-)paste does not trigger the loading. Sometimes, even typing an additional space, manually, still does not trigger the loading!