tab-icon-image always present after disabling throbber ?

[mz user]

I disabled the throbber because I use the progress meter from addon TMP and I find it more useful and there is no point in having them both.
Now every time the page is loading/reloading tab icon disappears remaining only tab text (which is logic).
Is there a way to make the tab icon always present even when loading/reloading web page ?

I've tried this after some googleing the net (not familiar at all with css) but is not working:
/* Load progress indicator */
.tab-throbber{display:none !important;}
/* Site favicon */
.tab-icon-image{visibility: visible !important;}

Sorry if this is posted in the wrong place, my bad
I'm using FF 50 on Win 10 x64.

[Brummelchen]

Is there a way to make the tab icon always present even when loading/reloading web page ?

i think not, both are childs of ".tab-icon" and switched by event.
but you can replace the throbber with a transparent image.

[mz user]

but you can replace the throbber with a transparent image.

Followed up on your idea and found a few solutions on the net (eg. http://tabmixplus.org/forum/viewtopic.p ... w=previous) which worked at the time (around 2005) but they don't work with the current version.

Thank you for taking the time to respond to the post.