This add-on enables offline caching on any web site or app, even those that aren't developed with this feature in mind, allowing use when Internet isn't available. This works by injecting a dedicated Service Worker on any host you choose via the popup menu, so it has the benefit of using an established and well-tested web technology to do its job. Due to Service Workers limitations, keep in mind that this only works on HTTPS sites and outside of private browsing mode.
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Currently, the add-on can't delete cached data or the installed Service Workers when it gets uninstalled. If you need to uninstall it, please open the pop-up menu on the sites where you enabled Offline Caching to disable it and purge the cache. (Some mitigation to this issue will be implemented in the future.)
