HERE IS THE ANSWER
Here is the answer to get TABS BELOW with Firefox V90 . . copy all of this code below the broken line into your - userChrome.css - file and save it.
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HERE IS THE ANSWER
Here is the answer to get TABS BELOW with Firefox V90 . . copy all of this code below the broken line into your - userChrome.css - file and save it.
You can modify the 45px in this line if you wish to get an appropriate height . . just experiment with different numbers till you get it right
--menubar-height: 45px; /*30px|41px=11px; caption buttons on menubar*/
Also to make the tabs wider or narrower, modify the line which is coded
width: 50vw !important;
Finally you must enable - css - in Firefox, by typing about:config into your address bar, and search for toolkit.
When all the toolkit options appear change the one which says
toolkit.legacyUserProfileCustomizations.stylesheets
to TRUE by click the icon in the right hand column.
Than close Firefox and reopen, and check how it looks
This will enable your - css - file to be read, and interpreted and accepted by the Firefox browser.
-------------------------------------------------------------------
@namespace url("http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul");
/* TABS: bottom - Firefox 65 and later - updated for 89+ */
/* https://searchfox.org/mozilla-release/source/browser/themes/shared/tabs.inc.css */
/* https://raw.githubusercontent.com/Aris-t2/CustomCSSforFx/master/classic/css/tabs/tabs_below_navigation_toolbar_fx89.css */
/* https://developer.mozilla.org/en-US/docs/Tools/Browser_Toolbox */
/* ROOT - VARS */
/* you can adjust the CSS variables until it looks correct */
/* you can use the Browser Toolbox to get the toolbar heights */
*|*:root {
--tab-toolbar-navbar-overlap: 0px !important;
--tab-min-height: 40px !important;
--tab-min-width: 60px !important;
--tab-adjust: 0px; /* adjust tab bar - only for 68-73 */
--tab-caption: 5px; /* caption buttons on tab bar */
}
/* TAB BAR - below nav-bar */
#navigator-toolbox toolbar:not(#nav-bar):not(#toolbar-menubar) {-moz-box-ordinal-group:10 !important;}
#TabsToolbar {-moz-box-ordinal-group:1000 !important;}
#TabsToolbar {
display: block !important;
position: absolute !important;
bottom: 0 !important;
width: 50vw !important;
}
#tabbrowser-tabs {
width: 100vw !important;
}
/* navigator-toolbox - PADDING */
*|*:root:not([chromehidden*="toolbar"]) #navigator-toolbox {
position: relative !important; /*89+*/
padding-bottom: calc(var(--tab-min-height) + 1px) !important; /*ADJUST*/
background-color: var(--toolbar-bgcolor) !important;
}
/* TabsToolbar with menubar and titlebar hidden - rules for Firefox 65-73 */
*|*:root[tabsintitlebar]:not([inFullscreen="true"]):not([sizemode="maximized"]) #toolbar-menubar[autohide="true"] ~
#TabsToolbar{
bottom: var(--tab-adjust); /*ADJUST*/
}
/* TABS: height */
#tabbrowser-tabs,
#tabbrowser-tabs > .tabbrowser-arrowscrollbox,
.tabbrowser-tabs[positionpinnedtabs] > .tabbrowser-tab[pinned] {
min-height: var(--tab-min-height) !important;
max-height: var(--tab-min-height) !important;
}
#TabsToolbar {
height: var(--tab-min-height) !important;
margin-bottom: 1px !important;
box-shadow: ThreeDShadow 0 -1px inset, -moz-dialog 0 1px !important; /*OPTIONAL*/
background-color: var(--toolbar-bgcolor) !important;
color: var(--toolbar-color) !important;
/* z-index: 1 !important; */
}
/* indicators *//*
*|*:root[privatebrowsingmode=temporary] .private-browsing-indicator {
position: absolute !important;
display: block !important;
right: 0px !important;
bottom: 0px !important;
width: 14px !important;
pointer-events: none !important;
}
*/
.private-browsing-indicator {display: none !important;}
.accessibility-indicator {display: none !important;}
/* Indicators - HIDE *//*
*|*:root:not([accessibilitymode]) .accessibility-indicator {display: none !important}
*|*:root:not([privatebrowsingmode=temporary]) .private-browsing-indicator {display: none !important}
*/
/* Drag Space */
.titlebar-spacer[type="pre-tabs"],
.titlebar-spacer[type="post-tabs"] {
width: 20px !important;
}
/* Override vertical shifts when moving a tab */
#navigator-toolbox[movingtab] > #titlebar > #TabsToolbar {
padding-bottom: unset !important;
}
#navigator-toolbox[movingtab] #tabbrowser-tabs {
padding-bottom: unset !important;
margin-bottom: unset !important;
}
#navigator-toolbox[movingtab] > #nav-bar {
margin-top: unset !important;
}
/* Hide window-controls and caption buttons on Tab Bar */
#TabsToolbar #window-controls {display: none !important;}
#TabsToolbar .titlebar-buttonbox-container {display: none !important;}
