Firefox will only open once
I can run Firefox once per profile & then it won't start again. I have to make a new profile to get it to open again. Alternatively, I can start Safe Mode and then exit after the prompt with the options to enter Safe Mode. After that I can start Firefox normally, but only once. Then I have to either create a new profile or get the prompt to enter Safe Mode. Without the Safe Mode trick profiles can only be used once before Firefox fails to start again. I already tried to treat this as an add-on problem, which is when I discovered that it was the fact that I ran Safe Mode, rather than because I disabled any add-ons, that made the difference. I have also uninstalled and reinstalled Firefox more than once.
This happened
Every time Firefox opened
== This is a relatively new build
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Hello Mark.
You may be having a problem with some Firefox add-on that is hindering your Firefox's normal behavior. Have you tried disabling all add-ons (just to check), to see if Firefox goes back to normal?
Whenever you have a problem with Firefox, whatever it is, you should make sure it's not coming from one of your installed add-ons, be it an extension, a theme or a plugin. To do that easily and cleanly, run Firefox in safe mode and select Disable all add-ons. If the problem disappears, you know it's from an add-on. Disable them all in normal mode, and enable them one at a time until you find the source of the problem. See this article for information about troubleshooting extensions and theme. You can troubleshoot plugins the same way.
If you want support for one of your add-ons, you'll need to contact its author.
Do you get any error messages if you try to start Firefox a second time? Can you restart Firefox with that same profile after a reboot of the computer?