That looks like a JavaScript confirm() prompt ([https://developer.mozilla.org/docs/Web/API/Window/confirm]). When you click OK, it should return true to the function and the function should proceed. Possibly the problem is after that point, but other than point you to the Web Console, I wouldn't have any further leads on what the problem is. You can open the Web Console in the lower part of the tab using either: * "3-bar" menu button > Web Developer > Web Console * (menu bar) Tools > Web Developer > Web Console * (Windows) Ctrl+Shift+k Then reload the page in the upper part of the tab and watch for error or security messages. (The lines with blue triangles generally are not significant unless you suspect a style rule problem.) Anything that sounds like it could be relevant? Then try the action that isn't working and check for any new messages. Of course, if it says that blah blah is not a function or some other issue, it's probably beyond our ability to help without access to the site. But if it says that a file was blocked from loading for some reason, that's might be illuminating. ---- And more generally: If a site is known to work in Firefox, these are general suggestions to try when it stops working normally: '''Cache and Cookies:''' When you have a problem with one particular site, a good "first thing to try" is clearing your Firefox cache and deleting your saved cookies for the site. (1) Clear Firefox's Cache See: [[How to clear the Firefox cache]] If you have a large hard drive, this might take a few minutes. (2) Remove the site's cookies (save any pending work first). While viewing a page on the site, try either: * right-click (on Mac Ctrl+click) a blank area of the page and choose View Page Info > Security > "View Cookies" * (menu bar) Tools > Page Info > Security > "View Cookies" * click the padlock or "i" icon in the address bar, then the ">" button, then More Information, and finally the "View Cookies" button In the dialog that opens, the current site should be pre-filled in the search box at the top of the dialog so you can remove that site's cookies individually. Then try reloading the page. Does that help? '''Double-check content blockers:''' Firefox's Tracking Protection feature and extensions that counter ads and tracking may break websites that weren't built to operate normally without the blocked components. Do you see a shield icon toward the left end of the address bar, near the lock icon? More info on managing the Tracking Protection feature in this article: [[Tracking Protection]]. Extensions such as Adblock Plus, Blur, Disconnect, Ghostery, NoScript, Privacy Badger, uBlock Origin or uMatrix should provide toolbar buttons to manage blocked content in a page. There may or may not be a number on the icon indicating the number of blocked items; you may need to click the button to see what's going on and test whether you need to make an exception for this site. '''Testing in Firefox's Safe Mode:''' In its Safe Mode, Firefox temporarily deactivates extensions, hardware acceleration, and some other advanced features to help you assess whether these are causing the problem. ''If Firefox is not running:'' Hold down the Shift key when starting Firefox. (On Mac, hold down the option/alt key instead of the Shift key.) ''If Firefox is running:'' You can restart Firefox in Safe Mode using either: * "3-bar" menu button > "?" Help > Restart with Add-ons Disabled * (menu bar) Help menu > Restart with Add-ons Disabled and OK the restart. ''Both scenarios:'' A small dialog should appear. Click "Start in Safe Mode" (''not'' Refresh). Any improvement?

works when run in safe mode with all plugins disabled issue was this plugin https://addons.mozilla.org/en-US/firefox/addon/enable-rightclick-and-copy/?src=api whitelist from this plugin dont work but disabling works