skeleton.

extension/background.js

@@ -0,0 +1,9 @@
+browser.runtime.onMessage.addListener((req, sender, reply) => {
+  switch (req.type) {
+    case 'getPublicKey':
+      reply({})
+      break
+    case 'signEvent':
+      break
+  }
+})

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})
+  }
+})

extension/manifest.json

@@ -0,0 +1,29 @@
+{
+  "name": "nos2x",
+  "description": "Nostr Signer Extension",
+  "version": "0.0.1",
+  "manifest_version": 2,
+  "icons": {
+    "16": "icons/icon-16x16.png",
+    "48": "icons/icon-48x48.png",
+    "128": "icons/icon-128x128.png"
+  },
+  "options_page": "options.html",
+  "background": {
+    "scripts": [
+      "background.js"
+    ],
+    "persistent": false
+  },
+  "content_scripts": [{
+    "matches": ["<all_urls>"],
+    "js": [
+      "content-script.js"
+    ]
+  }],
+  "permissions": [
+    "activeTab",
+    "storage"
+  ],
+  "content_security_policy": "script-src 'self' 'unsafe-eval'; object-src 'self';"
+}

extension/nostr-provider.js

@@ -0,0 +1,4 @@
+window.nostr = {
+  getPublicKey() {},
+  signEvent(event) {}
+}