Recent answers to Firefox Prevents Local Machine File Access But Firefox Dev Ed Allows It . . .https://support.mozilla.org/en-US/questions/13741622022-04-17T22:46:36-07:00I see no Solved Problem button.
The Solution chosen text beside Undo button is non-clickable to me.
2022-04-17T22:46:36-07:00tamjkhttps://support.mozilla.org/en-US/questions/1374162#answer-1498380<p>I see no Solved Problem button.
</p><p>The <em>Solution chosen</em> text beside Undo button is non-clickable to me.
</p>That was very good work. Well Done.
Please flag your last post as Solved Problem
as this can2022-04-17T12:10:42-07:00fredmcd-hotmailhttps://support.mozilla.org/en-US/questions/1374162#answer-1498308<p>That was very good work&#46; Well Done&#46;
Please flag your last post as <strong>Solved Problem</strong>
as this can help others with similar problems&#46;
Go to that post and click the 'Solved' button to its right.
</p>Sorted.
The frontend JavaScript had an error in it after a recent update that sent the XHR to an und2022-04-17T10:18:53-07:00tamjkhttps://support.mozilla.org/en-US/questions/1374162#answer-1498299<p>Sorted.
</p><p>The frontend JavaScript had an error in it after a recent update that sent the XHR to an undefined endpoint.
It was this that triggered a CORS error in Firefox, not the fact that I was using a local server call.
</p><p>Why FFDE showed no error was likely that the browser cache had not been cleared since the web app was last run on it. I can explain it no other way.
</p><p>Anyway, after correcting the frontend request sending script - and taking care to close FF, clear the cache etc and restart FF - all ran well on both browsers.
</p>