Hi MartyJames, In the What’s new in Firefox! for version 69.0 a change has been made:

"Firefox no longer loads userChrome.css or userContent.css by default improving start-up performance. Users who wish to customize Firefox by using these files can set the toolkit.legacyUserProfileCustomizations.stylesheets preference to true to restore this ability."

Hmmm. That setting seems to be already set to true (status "modified", type "boolean", value "true") and yet my search engines have no text labels!?

I wonder if there's some way to test if userChrome is running or not?

Bump.

What code do you currently use?

Edit:

Sorry, I tried posting but this forum's formatting syntax doesn't allow code to be posted. (For example, the hash/pound symbol is being changed into a numbered list.)

OK, I've worked out a way to post the code. I have placed quotation marks around the asterisks and hash symbols…

@namespace url("http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul");
#TabsToolbar {
    visibility: collapse;
}

/*
  HELLO! This script has optional settings that you can try out if you return to its page: https://userstyles.org/styles/122214/firefox-search-bar-show-engine-names-firefox-43
*/
@-moz-document url(chrome://browser/content/browser.xul) {
  /* Make the one-off buttons span the full width */
  #PopupSearchAutoComplete .searchbar-engine-one-off-item[tooltiptext] {
    width: 100% !important;
    height: 24px !important;
    background-image: none !important;
    padding-left: 6px !important;
    box-sizing: content-box !important;
    line-height: 1em !important;
  }
  /* Hide the empties */
  #PopupSearchAutoComplete .searchbar-engine-one-off-item:not([tooltiptext]) {
    display: none !important;
  }
  /* Fix up borders */
  #PopupSearchAutoComplete .searchbar-engine-one-off-item[tooltiptext], 
  #PopupSearchAutoComplete .addengine-item {
    border-bottom: 1px solid #ccc !important;
  }
  #PopupSearchAutoComplete .search-setting-button.search-panel-header, 
  #PopupSearchAutoComplete .addengine-item,
  #PopupSearchAutoComplete .search-panel-header.search-panel-current-input {
    border-top: none !important;
    max-height: 26px !important;
    min-height: 16px !important;
    padding-top: 1px !important;
  }
  /* Insert descriptive name for search engine plugin */
  #PopupSearchAutoComplete .searchbar-engine-one-off-item[tooltiptext]::after {
    content: attr(tooltiptext);
    margin: 5px 6px 0px !important;
    display: block !important;
  }
  /* Fix icon positioning */
  #PopupSearchAutoComplete .searchbar-engine-one-off-item[tooltiptext] > .button-box {
    display: inline-flex !important;
    width: 16px !important;
    max-width: 16px !important;
    border: none !important;
    padding: 0 0 !important;
  }
  #PopupSearchAutoComplete .searchbar-engine-one-off-item[tooltiptext] > .button-box > .button-icon {
    display: block !important;
    margin-top: 4px !important;
    margin-left: -1px !important;
  }
  /* Lock in space for 5 search suggestions with scroll bar */
  #PopupSearchAutoComplete .autocomplete-tree.plain.search-panel-tree .tree-bodybox,
  #PopupSearchAutoComplete .autocomplete-tree.plain.search-panel-tree .autocomplete-treebody {
    display: flex !important;
    flex: 1 1 auto !important;
  }
  #PopupSearchAutoComplete .autocomplete-tree.plain.search-panel-tree .autocomplete-treebody {
    max-height: calc(5 * 1.5em) !important;
    min-height: calc(5 * 1.5em) !important;
  }
  #PopupSearchAutoComplete .autocomplete-tree.plain.search-panel-tree .tree-scrollbar[collapsed="true"] {
    visibility: visible !important;
  }
  /* User style options */
    /* Two columns - standard spacing */
  #PopupSearchAutoComplete {
    width: calc(32em + 14px) !important;
    min-width: calc(32em + 14px) !important;
  }
  #PopupSearchAutoComplete .searchbar-engine-one-off-item[tooltiptext] {
    width: 16em !important;
    white-space: nowrap;
    overflow: hidden;
  }
    /* Hiding "Search for ..." */
  #PopupSearchAutoComplete .search-panel-header.search-panel-current-input {
    display: none !important;
  }
    /* Not hiding "Add ..." engine */
    /* Not hiding "Change Search Settings" */
    /* Search bar tooltip text only visible on mouseover */
    /* No color scheme */
    /* No color scheme for hover */
}

/*AGENT_SHEET*/

/* Firefox 57+ userChrome.css tweaks ****************************************************/
/* code mostly taken from 'Classic Theme Restorer' & 'Classic Toolbar Buttons' add-ons **/
/* by Aris (aris-addons@gmx.net)*********************************************************/
/* Github: https://github.com/aris-t2/customcssforfx ************************************/
/****************************************************************************************/



#PersonalToolbar {
  min-height: unset !important;
  max-height: unset !important;
/* text-align: center !important; */
}

#PersonalToolbar #PlacesToolbarItems {
  overflow-x: visible !important;
  overflow-y: visible !important;
  display: inline-block !important;
}

In Firefox 68 it is no longer browser,xul, has changed to browser.xhtml

Maybe this is all you need to change:

@-moz-document url(chrome://browser/content/browser.xul) =>
@-moz-document url(chrome://browser/content/browser.xhtml) {

Thanks so much cor-el! :-) Your solution worked!

It was simply a case of changing a "u" to an "htm"!