skeleton.

extension/content-script.js

@@ -0,0 +1,24 @@
+// inject the script that will provide window.nostr
+let script = document.createElement('script')
+script.src = 'nostr-provider.js'
+document.head.appendChild(script)
+
+// listen for messages from that script
+window.addEventListener('message', async ev => {
+  if (ev.source !== window) return
+  if (!ev.data || ev.data.ext !== 'nostr') {
+    // pass on to background
+    var reply
+    try {
+      reply = browser.runtime.sendMessage({
+        ...ev.data,
+        host: window.location.host
+      })
+    } catch (error) {
+      reply = {error}
+    }
+
+    // return response
+    window.postMessage({id: ev.data.id, reply})
+  }
+})