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Restore non-beta version.
Your beta version does not support Lastpass. I need to restore the previous, non-beta version.
選ばれた解決策
Note that it is the opposite and that the extension developer need to support a specific Firefox release. In this case it is more complicated because Firefox 57+ versions only support WebExtensions and a complete rewrite of a legacy extension is necessary.
You can do a clean reinstall of the Firefox 56 release and uninstall the Firefox 57 version.
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選ばれた解決策
Note that it is the opposite and that the extension developer need to support a specific Firefox release. In this case it is more complicated because Firefox 57+ versions only support WebExtensions and a complete rewrite of a legacy extension is necessary.
You can do a clean reinstall of the Firefox 56 release and uninstall the Firefox 57 version.