Update README.md

BaseMax · Jun 25, 2019 · cc0e0b6 · cc0e0b6
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@@ -5,3 +5,10 @@ The firefox addon for analyzing the purchase of Airplane tickets.
 ### Installing
 
 Open `about:debugging` in Firefox, click **"Load Temporary Add-on"** and select any file in your extension's directory.
+
+### Sign
+
+```
+$ npm install --global web-ext
+$ web-ext sign --api-key=user:****:0 --api-secret=*****
+```