+/* A number of styles use :-moz-any(#palette-box, #navigator-toolbox[iconsize], #addon-bar) - this makes it only apply pre-Australis as iconsize and palette-box or addon-bar don't exist afterwards */
+:-moz-any(#palette-box, #navigator-toolbox[iconsize], #addon-bar) #back-button {
+ -moz-image-region: rect(0, 18px, 18px, 0);
+}
+
+:-moz-any(#palette-box, #navigator-toolbox[iconsize], #addon-bar) #back-button:not([disabled="true"]):hover {