Firefox Tekoha Aty

I have been an avid user of the Firefox browser on my PC for over a decade but a few days ago, when I tried to access a website on my Firefox browser, it would not connect me to the website. I have many tabs open in my browser and when I try to access any of the tabs, I get the same problem. There's a dot that moves endlessly back and forward in the tab while the screen remains blank. In the heading next to the website address it says "not secure", but it is saying this for all the websites that I was previously able to access and any new website that I enter. How can I fix this to access websites? I have tried restarting my computer but that has not fixed it.

I travel to two different locations a few times a year. I use the same basic "computer" for each one, though they're far apart. It works through a "sneaker network," where data files, profiles, etc, are copied to a portable hard drive and then copied to the next computer, so they're fairly identical.

The problem is that this last time (and I've been doing this for perhaps about 3 years), Firefox has refused to do anything online. I can use it offline, but not online. The "work online" is unchecked, so it should be online. But it refuses to do anything.

After several Firefox reboots, windows reboots, checking everything, Firefox still does nothing.

Currently I'm using Waterfox and Edge. Both work fine. Thunderbird works fine.

I've had this problem since Tuesday night. So about 48 hours now, and nothing at all.

The way I transfer from one computer to another without losing email or current Firefox status is to copy the newest profile over, delete the old, and then copy the current program, as well.

Thus, the program is up to date, as is the profile, but all I get when I type in any address is that dot thing at the top, going side to side.

Thank you in advance.

For the last day or so, Firefox is refusing to resolve any web pages. I have had to write this in Safari, so I can't share the data from Firefox. Sorry.

Please help, thank you :)

2017 iMac, OS 13.6.9, Firefox 140.0.4

Firefox ne peut établir de connexion avec le serveur à l’adresse dl.google.com. Firefox cannot establish a connection with the server at dl.google.com.

I just downloaded version 140.0.4 for Mac. Now Firefox will not open any website pages. I added Firefox to the list of allowed apps in my firewall settings but that did not fix the problem. Please help. Thank you.