This is fairly common for extensions to be on Chrome/Firefox but not Safari, unfortunately. Firefox's WebExtension APIs are mostly code-compatible with the exte

This is fairly common for extensions to be on Chrome/Firefox but not Safari, unfortunately. Firefox's WebExtension APIs are mostly code-compatible with the extension API supported by Google Chrome and Opera, with a few exceptions [1]. Safari uses its own Safari Extensions JS, so while it may be possible to share some resources (e.g. images, HTML content), the js work needs to be undertaken as a separate development project, unless you use/build a polyfill. [1] https://developer.mozilla.org/en-US/docs/Mozilla/Add-ons/WebExtensions/Chrome_incompatibilities https://developer.mozilla.org/en-US/docs/Mozilla/Add-ons/Web...