Update README.md

README.md

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 # No PDF Download+
 
 While most PDF files can be viewed directly in the browser some PDFs will trigger a "Save as"-dialog or will be downloaded automatically. This addon views all PDF files directly in the browser. You can still save the PDF by pressing CTRL+S (or CMD+S) after viewing them.
+
+# How to install on Chrome
+
+1. Download the latest release from https://github.com/lorenzoverardo/no-pdf-download-plus/releases
+2. Extract the zip file to a folder (the first file under `Assets`)
+3. Visit `chrome://extensions`
+4. Enable Developer Mode
+5. Click on Load Unpacked Button
+6. Select the folder where you extracted the zip
+7. Enjoy