WIP still a lot to let the service worker holding the common logic

  * components should register there listeners themselve
  * always return a cleaning handle when registering listeners
  * de-duplicated code from the popup layer (pushed back in the
    service worker)

.eslintrc

@@ -3,7 +3,8 @@
   "parserOptions": {
     "ecmaVersion": 2022,
     "ecmaFeatures": {
-      "legacyDecorators": true
+      "legacyDecorators": true,
+      "importAssertions": true
     }
   },
   "extends": [
@@ -13,6 +14,7 @@
   "rules": {
     "func-names": 0,
     "indent": ["error", 2],
+    "import/no-extraneous-dependencies": ["error", {"devDependencies": ["**/*"]}],
     "max-len": [2, 120, 2, {
       "ignoreUrls": true,
       "ignoreTemplateLiterals": true,
@@ -30,6 +32,7 @@
     "no-unused-expressions": 0,
     "no-use-before-define": ["error", {"variables": false}],
     "no-useless-escape": 0,
+    "operator-linebreak": "off",
     "prefer-destructuring": ["error", {
       "array": false,
       "object": false

.gitignore

@@ -18,3 +18,6 @@ ftest/.settings/
 selenium-standalone.txt
 .local
 .nix/.devenv
+.env.chrome
+.env.firefox
+.env.local

.hintrc

@@ -0,0 +1,14 @@
+{
+  "extends": [
+    "development"
+  ],
+  "hints": {
+    "meta-viewport": "off",
+    "axe/language": [
+      "default",
+      {
+        "html-has-lang": "off"
+      }
+    ]
+  }
+}