Manual Install

Chrome

1. Download the extension
2. Unzip it to a folder (e.g Documents/CumLoad)
3. Visit chrome://extensions
4. Enable developer mode (top right)
5. Import the unpacked extension from the folder
6. You can now disable developer mode

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Firefox

1. Visit about:config
2. Set xpinstall.signatures.required to false
3. Download the extension
4. Import the extension using the cog at the center-top of the page
5. Toggle the extension on and off

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Kiwi

1. Download the extension
2. Visit kiwi://extensions
3. Enable developer mode (top right)
4. Import the extension using the + (from .zip/.crx/.user.js) button
5. You can now disable developer mode