Does it still happen in Troubleshoot Mode?

You can try these steps in case of issues with webpages:

You can reload webpage(s) and bypass the cache to refresh possibly outdated or corrupted files.

• hold down the Shift key and left-click the Reload button
• press "Ctrl + F5" or press "Ctrl + Shift + R" (Windows,Linux)
• press "Command + Shift + R" (Mac)

Clear the Cache and remove the Cookies for websites that cause problems via the "3-bar" Firefox menu button (Settings).

"Remove the Cookies" for websites that cause problems:

• Settings -> Privacy & Security
  Cookies and Site Data: "Manage Data"

"Clear the Cache":

• Settings -> Privacy & Security
  Cookies and Site Data -> Clear Data -> [X] Cached Web Content -> Clear

• https://support.mozilla.org/en-US/kb/clear-cookies-and-site-data-firefox
• https://support.mozilla.org/en-US/kb/how-clear-firefox-cache

Start Firefox in Troubleshoot Mode to check if one of the extensions ("3-bar" menu button or Tools -> Add-ons -> Extensions) or if hardware acceleration or if userChrome.css/userContent.css is causing the problem.

• switch to the Default System theme: "3-bar" menu button or Tools -> Add-ons -> Themes
• do NOT click the "Refresh Firefox" button on the Troubleshoot Mode start window

• https://support.mozilla.org/en-US/kb/diagnose-firefox-issues-using-troubleshoot-mode
• https://support.mozilla.org/en-US/kb/troubleshoot-extensions-themes-to-fix-problems

• https://support.mozilla.org/en-US/kb/enhanced-tracking-protection-firefox-desktop
• https://support.mozilla.org/en-US/kb/smartblock-enhanced-tracking-protection
• https://support.mozilla.org/en-US/kb/trackers-and-scripts-firefox-blocks-enhanced-track

You can remove all data stored in Firefox for a specific domain via "Forget About This Site" in the right-click context menu of an history entry ("History -> Show All History" or "View -> Sidebar -> History").

Using "Forget About This Site" will remove all data stored in Firefox for this domain like history and cookies and passwords and exceptions and cache, so be cautious. If you have a password or other data for that domain that you do not want to lose, make sure to backup this data or make a note.

You can't recover from this 'forget' unless you have a backup of involved files.

If you revisit a 'forgotten' website, data for that website will be saved once again.

• https://support.mozilla.org/en-US/kb/delete-browsing-search-download-history-firefox

Sorry Guys,

None of these worked. I still cannot sign in to spectrum.com my account with Firefox 118.0.2. And, by way of reminder, this is NOT the 1st time this issue has come up. All previous times it HAS come up, it has taken a month or more to be able to do my account functions at Spectrum with Firefox. NO CLUE what it took the times before. I just kept trying and eventually was able to sign in to my account and pay the bill or whatever.

PLUS P.G.&E. has recently thrown a notification that Firefox is NO LONGER a supported browser although I was able to sign in to my P.G.&E. account and pay my bill, the notification says "some functions may not work" with Firefox and the other "unsupported browsers".

I'll find a way through all this, I guess,and in the meantime I guess I'll have to use MS Edge,

but THANKS for your time and efforts.

Oldheart

Does it still happen in a new profile? An easy way to test a new profile is to install Developer Edition and see if it happens there or refresh your existing profile.

Guys,

As I said before, again this has taken care of itself in some unknown, unexplained manner. I just now went to spectrum.net and was able to sign in without problems. It happens every year or two and sometimes takes a month or more before I can sign in and do business in their website. Much shorter for the issue to go away. Why? Not a clue.

Thanks again for all your consideration and efforts. (I THINK it's probably a spectrum/charter glitch/issue but they won't admit it  ;-) )

JEC