Nebula: document that Troubleshooting Information now has a table indicating if there is a userChrome.css, userContent.css or unsupported JS modifications

[rtanglao]

For Aurora aka Thunderbird ESR 128 document:

• Thunderbird 117 (and of course Firefox) and newer have a Legacy User Stylesheets table in: ☰ > Help > Troubleshooting Information!

see:

• bug: 1902257 Add a line to about:support that identifies if the user has unsupported JS modifications
• bug: 1428402: Add a line to about:support that identifies if the user has userChrome.css or userContent.css
• this includes user.js as well as @dannycolin pointed out

Checklist:

• [ ] Find all the articles that reference this!
  • [ ] future 128 FAQ
  • [ ] SUMO KB Article: userChrome.css and .js and userContent are unsupported
  • [ ] maybe more :-)
• [ ] Edit the articles