If you can modify, but still see the animation then this specific animation isn't covered by this pref.

What animations do you want to stop?

The animations do not get disabled entirely, not even one, things are even worst neither other preferences apart of this no matter which get the right result.

dsd7 said

The animations do not get disabled entirely, not even one, things are even worst neither other preferences apart of this no matter which get the right result.

What kind of animations are you trying to disable? The preference refers to some user interface animations, not website animations.

jscher2000 said

dsd7 said

The animations do not get disabled entirely, not even one, things are even worst neither other preferences apart of this no matter which get the right result.

What kind of animations are you trying to disable? The preference refers to some user interface animations, not website animations.

I refer to that ones, the interface animations.

dsd7 said

jscher2000 said

dsd7 said

The animations do not get disabled entirely, not even one, things are even worst neither other preferences apart of this no matter which get the right result.

What kind of animations are you trying to disable? The preference refers to some user interface animations, not website animations.

I refer to that ones, the interface animations.

Which interface animations? I guess I don't notice them very much.

The one you can see most is that with two moving blue dots on the left side when the tabs are loading.

dsd7 said

The one you can see most is that with two moving blue dots on the left side when the tabs are loading.

See :

https://www.reddit.com/r/firefox/comments/7cn1lp/ff_57_how_to_disable_blue_loading_animation_slide/

(but we've already established that it doesn't work)

Add code to the userChrome.css file below the default @namespace line.

• http://kb.mozillazine.org/userChrome.css

@namespace url("http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul"); /* only needed once */

.tab-throbber[busy]::before {
  background-image: url("chrome://global/skin/icons/loading.png") !important;
  animation: unset !important;
}
.tab-throbber[busy]:not([progress])::before {
  /* Grays the blue during "Connecting" state */
  filter: grayscale(100%);
}
@media (min-resolution: 2dppx) {
  .tab-throbber[busy]::before {
    background-image: url("chrome://global/skin/icons/loading@2x.png") !important;
  }
}

• https://www.userchrome.org/what-is-userchrome-css.html
• https://www.userchrome.org/how-create-userchrome-css.html

If you want a colored rotating throbber .tab-throbber[busy] stae then use this code instead of filter: grayscale(100%);.

.tab-throbber[busy]:not([progress])::before {filter: hue-rotate(150deg)}
.tab-throbber[busy][progress]::before {filter: hue-rotate(90deg)}

Adding code to the userChrome.css file is also mentioned at the bottom of that Reddit thread (posted by jscher2000 ......).

dsd7 said

The one you can see most is that with two moving blue dots on the left side when the tabs are loading.

Yes, that "tab throbber" design is annoying. I changed it on mine 21 months ago to return to the circling arrow: https://www.reddit.com/r/FirefoxCSS/comments/71vbds/revert_the_tab_throbber_in_firefox_57/

If you don't want to see any motion there, what would you prefer, just a static square or blank space?

jscher2000 said

dsd7 said

The one you can see most is that with two moving blue dots on the left side when the tabs are loading.

Yes, that "tab throbber" design is annoying. I changed it on mine 21 months ago to return to the circling arrow: https://www.reddit.com/r/FirefoxCSS/comments/71vbds/revert_the_tab_throbber_in_firefox_57/

If you don't want to see any motion there, what would you prefer, just a static square or blank space?

Just a static square, also I can manage with the circling arrow.

Thank you!

McCoy said

Adding code to the userChrome.css file is also mentioned at the bottom of that Reddit thread (posted by jscher2000 ......).

Thank you!

cor-el said

If you want a colored rotating throbber .tab-throbber[busy] stae then use this code instead of filter: grayscale(100%);.

.tab-throbber[busy]:not([progress])::before {filter: hue-rotate(150deg)}
.tab-throbber[busy][progress]::before {filter: hue-rotate(90deg)}

Thank you!

Maybe:

/* Blank "busy" tab throbber */
.tab-throbber[busy]::before {
  background-image: none !important;
  animation: unset !important;
}
/* Hide the blue swipe */
.tabbrowser-tab .tab-loading-burst {
  display: none !important;
}

Or if you want to see something there to know that the tab is at least trying to load:

/* Static globe for "busy" tab throbber */
.tab-throbber[busy]::before {
  background-image: url("chrome://mozapps/skin/places/defaultFavicon.svg") !important;
  opacity: 0.5 !important; /* Lighten to gray */
  animation: unset !important;
}
/* Hide the blue swipe */
.tabbrowser-tab .tab-loading-burst {
  display: none !important;
}

Thank you all for the help! I was not expected it.

Thank you!