This site will have limited functionality while we undergo maintenance to improve your experience. If an article doesn't solve your issue and you want to ask a question, we have our support community waiting to help you at @FirefoxSupport on Twitter and/r/firefox on Reddit.

Search Support

Avoid support scams. We will never ask you to call or text a phone number or share personal information. Please report suspicious activity using the “Report Abuse” option.

Learn More

Strange window-border artifacts and TFSC Add-on dissonance...

more options

With Mac OS 10.13.2 and TB 55.5.2 using high-contrast Charcoal theme, Theme Font & Size Changer v. 62.0 does not work at all, rendering TB unusable for me.

Suddenly, without my having changed anything, when TB opens windows, they appear momentarily with a thick black-line border on the sides (but not in the corners) around a white interior, and then the actual content renders and the border disappears. Shortly after that, Theme Font & Size Changer (version 56 something) no longer functioned. I have tried all the usual routines, re-launching, re-booting, re-installing the Add-on, updating the Add-on, re-installing TB... all to no avail.

My other Add-ons are:

  Edit Mail Subject
  Get/Send-Button
  Google Search for TB
  Lightning
  More Functions for Address Book
  Signature Switch

None of these have changed for months, with no changes shortly before the behavior described above. Nor did they start upon OS upgrade.

Any thoughts on what's this all about?

With Mac OS 10.13.2 and TB 55.5.2 using high-contrast Charcoal theme, Theme Font & Size Changer v. 62.0 does not work at all, rendering TB unusable for me. Suddenly, without my having changed anything, when TB opens windows, they appear momentarily with a thick black-line border on the sides (but not in the corners) around a white interior, and then the actual content renders and the border disappears. Shortly after that, Theme Font & Size Changer (version 56 something) no longer functioned. I have tried all the usual routines, re-launching, re-booting, re-installing the Add-on, updating the Add-on, re-installing TB... all to no avail. My other Add-ons are: Edit Mail Subject Get/Send-Button Google Search for TB Lightning More Functions for Address Book Signature Switch None of these have changed for months, with no changes shortly before the behavior described above. Nor did they start upon OS upgrade. Any thoughts on what's this all about?

Chosen solution

Theme and Font changer stopped working because the author put an end date in the add-on. Contact the add-on author for questions and updates to heir software.

There are dozens of posts about this and some have suggestions. Browse through them.

Read this answer in context 👍 2

All Replies (2)

more options

Suluhisho teule

Theme and Font changer stopped working because the author put an end date in the add-on. Contact the add-on author for questions and updates to heir software.

There are dozens of posts about this and some have suggestions. Browse through them.

more options

Thank You!

Thank You!