Config to set custom global CSS

interfacer/src/browsh/config_sample.go

@@ -22,6 +22,14 @@ websocket-port = 3334
 # then this experimental feature should help. It can also be toggled in-browser with F6.
 use_experimental_text_visibility = false
 
+# Custom CSS to apply to all loaded tabs, eg;
+#   custom_css = """
+#   body {
+#     background-colour: black;
+#   }
+#   """
+custom_css = ""
+
 [firefox]
 # The path to your Firefox binary
 path = "firefox"

webext/src/dom/manager.js

@@ -191,6 +191,7 @@ export default class extends utils.mixins(CommonMixin, CommandsMixin) {
       this.is_dom_loaded = true;
       this.log("DOM LOADED");
       this._fixStickyElements();
+      this._injectCustomCSS();
       this._willHideText();
     });
     window.addEventListener("load", () => {
@@ -251,4 +252,10 @@ export default class extends utils.mixins(CommonMixin, CommandsMixin) {
       }
     }
   }
+
+  _injectCustomCSS() {
+    var node = document.createElement("style");
+    node.innerHTML = this.config.browsh.custom_css;
+    document.body.appendChild(node);
+  }
 }