Hello,

Can you check your firewall settings for Firefox? After updating an application, firewalls can sometimes modify their rules.

Can you also check your pop-up settings?

• Tools (or ) > Options > Content

Some users needed to add an exception to gmail to allow pop-ups: https://support.mozilla.org/en-US/questions/1018234

I tried that also, actually I don't have any problem with popup window, my problem is with attaching the file. Please find the attached image.

What happens if you try uploading in Safe Mode?

Firefox Safe Mode is a troubleshooting mode that turns off some settings, disables most add-ons (extensions and themes).

If Firefox is open, you can restart in Firefox Safe Mode from the Help menu:

• Click the menu button , click Help and select Restart with Add-ons Disabled.

If Firefox is not running, you can start Firefox in Safe Mode as follows:

• On Windows: Hold the Shift key when you open the Firefox desktop or Start menu shortcut.

When the Firefox Safe Mode window appears, select "Start in Safe Mode".

If the issue is not present in Firefox Safe Mode, your problem is probably caused by an extension, and you need to figure out which one. Please follow the Troubleshoot extensions, themes and hardware acceleration issues to solve common Firefox problems article to find the cause.

To exit Firefox Safe Mode, just close Firefox and wait a few seconds before opening Firefox for normal use again.

When you figure out what's causing your issues, please let us know. It might help others with the same problem.

followed all steps you stated above. but no luck. if I click retry button several times it uploads. it takes average of 25 clicks to upload a file, but i don't have any problem in my yahoo mail see attached