Also, someone from Firefox said it was an issue with the add-on. But that is not true, because TotalAV with Webshield works fine with Chrome. Having more & more issues with Firefox.

I have contacted TotalAV - that's the FIRST person I contacted. And they did a troubleshooting & found it's a Firefox issue. Now I need Firefox's assistance.

My apologies for not having that information at hand. I've been working on this for so long. I'll have to get back in touch with TotalAV. Thanks. Will get back to you.

I have already reached out to TotalAV as my initial point of contact regarding the issue at hand. After their troubleshooting, they determined that it is a Firefox-related problem. Now, I require assistance from Firefox to address the issue further. This unique situation calls for support and guidance directly from Firefox.

Forget it...since this has taken so long to resolve, I just dumped TotalAV. Mark this as "a black hole."

Thank you for letting us know. I will keep an eye out for further reports of this issue though and see if we can establish what is happening.

Just to clarify how this works, since I don't have the software:

You installed an add-on from TotalAV, and it is enabled on the Add-ons page (Ctrl+Shift+A).

Your Firefox window is maximized and you shut it down using the menu > Exit command. When Firefox starts up, its window is not maximized (we would expect it to carry over the same state as the previous session when you allow Firefox to remember history, so this is odd).

If you then maximize Firefox, return to the Add-ons page (Ctrl+Shift+A), and disable TotalAV by clicking off its slider switch, then exit Firefox and start it up again. Firefox IS maximized this time? And the only difference was disabling the Total AV extension?

Yes, exactly!! But the 2 add-ons that get installed with TotalAV are their Total Adblock and Total Webshield. It's the Total Webshield that seems to create the problem, and when I disabled it, the browser window maximized & stayed that way.

Hmm, I can't replicate it. I tested the Total Webshield in a new, uncustomized profile, without installing anything else from the company. Rather than launch using the shortcut, I was using the about:profiles page where I created the test profile. I wonder whether it works differently if you have their main program installed, not just the add-on?

For reference if you're curious, this is the test profile procedure:

Inside Firefox, type or paste about:profiles in the address bar and press Enter/Return to load it.

Take a quick glance at the page and make a mental note of which Profile has this notation: This is the profile in use and it cannot be deleted. That is your current default profile.

Click the "Create a New Profile" button, then click Next. Assign a name like TotalAV, ignore the option to relocate the profile folder, and click the Finish button.

Firefox will switch your default profile to the new one, so click the Set as Default Profile button for your regular one to avoid an unwanted surprise at your next startup.

Scroll down to TotalAV and click its Launch profile in new browser button.

Firefox should open a new window that looks like a brand new, uncustomized installation. (Your existing Firefox window(s) should not be affected.) Please ignore any tabs enticing you to connect to a Sync account or to activate extensions found on your system to get a clean test.

Install the Total WebShield extension, make sure the window is maximized, and use menu > Exit.

On the about:profiles page, after about 10 seconds, use the Launch profile in new window button again to test.

Does the problem persist in the new profile?

When you are done with the experiment, you can close the extra window without affecting your regular Firefox profile. (TotalAV will remain available for future testing.)

This would have been helpful when the issue was happening back in January. But I have since uninstalled TotalAV. So I thank you for following up, but it's a little too late. Have a good evening!