
Simple open html file button
Simple button to open html file. Allow you to open local HTML page file on Android. You can choose multiply files at once. Add the extension page to your "Bookmarks" menu to open the page more convenient.

What is Simple open html file button?
Simple open html file button is a Firefox add-on that allows you to easily open local HTML page files on your Android device. It provides a simple button interface and allows you to choose multiple files at once. You can also add the extension page to your bookmarks for convenient access. To install the extension, follow the instructions provided in the links mentioned.

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Summary
Simple button to open html file. Allow you to open local HTML page file on Android. You can choose multiply files at once. Add the extension page to your "Bookmarks" menu to open the page more convenient.
You can not just install the extension from the site. It is Mozilla's restriction. The restriction made because not all Firefox for Android functionality implemented and some extension do not work properly. But some extensions work anyway. "Simple open html file button" works fine.
You can read how to install the extension on Firefox Nightly for Android. You can not install the extension on usual Firefox for Android. https://www.ghacks.net/2020/10/01/you-can-now-install-any-add-on-in-firefox-nightly-for-android-but-it-is-complicated/
Alternatively you can install a Firefox modification without the extension installing restriction https://github.com/fork-maintainers/iceraven-browser
Safety
Risk impact
Simple open html file button is safe to use. It does not request any sensitive permissions.
Risk likelihood
Simple open html file button has earned a fairly good reputation and likely can be trusted.