Update readme and icons

README.md

@@ -51,4 +51,24 @@ WTFPL licensed.
 3. Click **Load Temporary Add-on...**
 4. Select `dist/splirate-firefox-v<version>.xpi`
 
-Note: on standard Firefox, unsigned extensions are temporary via `about:debugging` and are removed on restart.
+Note: on standard Firefox, unsigned extensions are temporary via `about:debugging` and are removed on restart.
+
+## Signed Build Download
+
+- Direct signed XPI: [splirate-signed.xpi](https://git.zetaphor.com/zetaphor/splirate/releases/download/signed/splirate-signed.xpi)
+- Releases page: [Splirate Releases](https://git.zetaphor.com/zetaphor/splirate/releases)
+
+## Persistent Install (Private / Unlisted Signing)
+
+Use Mozilla's unlisted signing to get a persistent signed XPI without public listing.
+
+1. Create AMO API credentials:
+   - [Firefox Add-on Developer Hub](https://addons.mozilla.org/developers/)
+2. Export credentials in your shell:
+   - `export AMO_JWT_ISSUER="your-issuer"`
+   - `export AMO_JWT_SECRET="your-secret"`
+3. Run signing:
+   - `npm run sign`
+4. Install the signed `.xpi` from:
+   - `dist/signed/`
+   - Firefox: `about:addons` → gear icon → **Install Add-on From File...**