custom firefox chrome

firefox-no-single-tab

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+/*
+How To:
+1. Find your firefox profile folder : https://support.mozilla.org/en-US/kb/profiles-where-firefox-stores-user-data
+2. create a "chrome" folder if it doesn't exist
+3. Paste content of this gist in a "userChrome.css" file
+4. Restart Firefox
+Don't hesitate to say if there are bugs, I only tested this for my workflow : I don't use tabs
+at all but I want to see the bar if I open a tab by mistake (otherwise I sometimes lose a tab)
+*/
+#tabbrowser-tabs, #tabbrowser-tabs > .tabbrowser-arrowscrollbox {
+	min-height: 0 !important;
+}
+
+/* Thanks to @Speravir for making it work again in the latest versions. */
+#tabbrowser-tabs tab[first-visible-tab="true"][last-visible-tab="true"] {
+	visibility: collapse;
+}
+
+/* I don't use tabs so I just hide the new tab button. You should be able to use a similar trick as the rule above with
+css siblings selectors if you want to keep it when the tab bar is visible. */
+#tabbrowser-tabs .tabs-newtab-button { 
+	visibility: collapse !important;
+}
+
+#tabbrowser-tabs tab {
+	min-height: var(--tab-min-height)
+}