Well that was easy.

.gitignore

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+README.md.asc
+

README.md

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-# i2psetproxy.js
-WebExtension that automatically sets up a browser to use the proxy into i2p
+i2psetproxy.js
+==============
+
+WebExtension that automatically sets up a browser to use the proxy into i2p.
+This extension shouldn't be used on it's own, and the extension it should be
+used with aren't quite done yet. In conjunction with a hardened user.js or
+installed in a TBB, it's probably pretty safe. It doesn't contain any
+fingerprintable resources.
+
+Features
+--------
+
+  * [done] **Set** the http proxy to use the local i2p proxy
+  * [done] **Change** the color of the browser window to indicate that i2p is in use

background.js

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+browser.windows.onCreated.addListener(themeWindow);
+
+// Theme all currently open windows
+browser.windows.getAll().then(wins => wins.forEach(themeWindow));
+
+function themeWindow(window) {
+  // Check if the window is in private browsing
+  if (window.incognito) {
+    browser.theme.update(window.id, {
+      images: {
+        headerURL: "",
+      },
+      colors: {
+        accentcolor: "#A0A0DE",
+        textcolor: "white",
+        toolbar: "#A0A0DE",
+        toolbar_text: "white"
+      }
+    });
+  }
+  // Reset to the default theme otherwise
+  else {
+    browser.theme.update(window.id, {
+      images: {
+        headerURL: "",
+      },
+      colors: {
+        accentcolor: "#BFA0DE",
+        textcolor: "white",
+        toolbar: "#BFA0DE",
+        toolbar_text: "white"
+      }
+    });
+  }
+}

manifest.json

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+{
+  "manifest_version": 2,
+  "name": "I2P Proxy",
+  "version": "2.0",
+  "description": "Set up a browser to use the i2p http proxy automatically",
+  "background": {
+    "scripts": ["background.js", "proxy.js"]
+  },
+  "permissions": ["theme", "proxy"],
+  "applications": {
+    "gecko": {
+      "id": "i2psetproxy.js@eyedeekay.github.io",
+      "strict_min_version": "60.0"
+    }
+  }
+}

proxy.js

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+
+var proxySettings = {
+    proxyType: "manual",
+    http: "http://127.0.0.1:4444"
+    passthrough: ""
+    httpProxyAll: true
+};
+
+browser.proxy.settings.set({value:proxySettings});