create remove_textbox_focusring.css

content/remove_textbox_focusring.css

@@ -0,0 +1,8 @@
+/* Source file https://github.com/MrOtherGuy/firefox-csshacks/tree/master/content/remove_textbox_focusring.css made available under Mozilla Public License v. 2.0
+See the above repository for updates as well as full license text. */
+
+:where(textarea,input[type="text"],input[type="search"],input[type="password"],input[type="url"]){
+  appearance: none;
+  border-style: solid;
+  outline: none;
+}