1468253 - User css cannot reliably block tab loading throbber

Status: RESOLVED DUPLICATE of bug 1446713

(Firefox :: Tabbed Browser, defect)

Description

[MarjaE]

User Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.12; rv:60.0) Gecko/20100101 Firefox/60.0
Build ID: 20180605171542

Steps to reproduce:

I am photosensitive. The quantum tab loading throbber gives me migraines. I use the following userchrome, suggested on support, to try to replace the tab loading throbber:

/* Solid color tab throbber */
/* (A) Make it light gray while page is loading */
.tab-throbber[busy]::before {
  background-image: none !important;
  animation: unset !important;
  background-color: lightgray !important;
}
/* (B) Make it black while Firefox is connecting */
.tab-throbber[busy]:not([progress])::before {
  background-color: black !important;
}


Actual results:

It sometimes works, sometimes doesn't. In particular, it doesn't work when Firefox is loading.


Expected results:

There should be a more reliable way to block the tab loading throbber.

(A name like *throbber* is a good clue that something might cause migraines, e.g. it might involve repeated pulsing pain, and the current version involves reversing motion.)