Twitter Background Restorer - Restore your own Twitter background
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Add-on summary
The extension works by inserting a new CSS rule on the body of a twitter page based on the settings you choose. When you 'upload' the background image to the extension, it actually converts it into a Base64 representation of the image and stores it locally in your chrome extension storage.
This Base64 data is then inserted into the page using the background-image: url() method - which solves the problem of being unable to pull an image from an extra-twitter location (whether it be from another hosted source or from the local machine).
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Add-on safety
Risk impact
Twitter Background Restorer requires a lot of sensitive permissions. Exercise caution before installing.
Risk likelihood
Twitter Background Restorer is probably trust-worthy. Prefer other publishers if available. Exercise caution when installing this add-on.