End-to-end encrypted messaging for any website
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For developers or if you prefer to install manually
Download the ZIP file above and extract it to a folder
Go to chrome://extensions in your browser
Toggle "Developer mode" switch in the top right corner
Click "Load unpacked" and select the extracted folder
Click the Firefox Source button above
Go to about:config → Search for xpinstall.signatures.required → Set to false
Go to about:addons → Click gear icon → "Install Add-on From File" → Select the .xpi