reStyle - User Style Manager for Firefox 57+
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Add-on summary
This user style manager supports the usual installation of styles from URL and polling those URLs for updates. In addition to that, you can load local styles and apply styles to the browser UI.
Installing styles
Styles can be installed from userstyles.org, GitHub or any other website that offers appropriate styles for download. On userstyles.org, open the styles detail page, choose your settings if the style offers any, then click the reStyle icon in the browsers toolbar and "Add style" in the popup. On other pages, you need to open the .css file before clicking the reStyle icon.
UI styles
Starting with Firefox 57, it is no longer possible for Add-ons to directly apply user styles to anything else than normal websites. As a workaround, reStyle recognizes styles that will no longer work and writes them to the
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Add-on safety
Risk impact
reStyle requires some sensitive permissions that could impact your browser and data security. Exercise caution before installing.
Risk likelihood
reStyle is probably trust-worthy. Prefer other publishers if available. Exercise caution when installing this add-on.