New C-S-S webcompat intervention: modifyLocalStorage

src/features/web-compat.js

@@ -1,4 +1,4 @@
 import ContentFeature from '../content-feature.js'
 import { URL } from '../captured-globals.js'
 
 /**
@@ -117,6 +117,10 @@
         if (this.getFeatureSettingEnabled('screenLock')) {
             this.screenLockFix()
         }
+
+        if (this.getFeatureSettingEnabled('modifyLocalStorage')) {
+            this.modifyLocalStorage()
+        }
     }
 
     /** Shim Web Share API in Android WebView */
@@ -531,6 +535,22 @@
         }
     }
 
+    /**
+     * Support for modifying localStorage entries
+     */
+    modifyLocalStorage () {
+        /** @type {import('../types//webcompat-settings').WebCompatSettings['modifyLocalStorage']} */
+        const settings = this.getFeatureSetting('modifyLocalStorage')
+
+        if (!settings || !settings.changes) return
+
+        settings.changes.forEach((change) => {
+            if (change.action === 'delete') {
+                localStorage.removeItem(change.key)
+            }
+        })
+    }
+
     /**
      * Support for proxying `window.webkit.messageHandlers`
      */