Hi italiangm, is https://www.spectrum.net/ associated with your internet service? I wonder if they are doing some kind of filtering.

Unfortunately, there are sometimes problems with Firefox bookmarks becoming corrupted. Firefox has a little maintenance feature built-in that can verify and clean up bookmarks (and history). I have no idea if it will help with this issue, but it only takes a couple minutes:

Open Firefox's Troubleshooting Information page using any of these methods:

• "3-bar" menu button > "?" Help > Troubleshooting Information
• (menu bar) Help > Troubleshooting Information
• type or paste about:support in the address bar and press Enter

Near the bottom, there is a section titled Places Database -- that's the file which stores history and bookmarks. Click the button labeled Verify Integrity. There may be a 10-15 second delay before results appear.

If all is well, the report that appears below the button should start with:

> Task: checkIntegrity
+ The places.sqlite database is sane
+ The favicons.sqlite database is sane

(etc. etc.)

Hi jscher2000.

Yes, Charter Spectrum is my ISP.

Thanks for providing a possible solution. Unfortunately, the Verify Integrity process did not fix the problem, but good to know the databases are squeaky clean now.

When redirect occurred again this morning, I opened browser history to look for clues. Apparently Charter Spectrum periodically injects a script which points users to their TOS at http://tandc-browsermessaging.charter.net. That page displays for barely a second then redirects to https://www.spectrum.net/.

I've had NoScript installed for years now, so I explicitly set http://tandc-browsermessaging.charter.net to 'untrusted' which blocks the page from displaying. We'll see how it goes.

Thanks again for your kind assistance.