Cannot Open local files. Terrible app, deleted it after losing invaluable time

It works but I had to delete after 5 minutes due to annoying prompt messages

Было нужно дополнение, позволяющее просматривать XLSX-файлы по ссылкам, размещенным в вебе. Установка этого приложения задачу не решила: по-прежнему выдается запрос на сохранение файла, выбор приложения из числа установленных, и выбор в этом списке браузера лишь открывает еще одну вкладку, и выдает запрос повторно.

Can't actually open XLS files with this extension. It also demanded I disable my AdBlock or it wouldn't let me use the extension, which is a;ready a huge strike for me (I've gladly disabled AdBlock for sites that kindly asked me to WITHOUT disabling their site for me, I resent it and just click close when forced), and after I tried that, it STILL gave me the "disable AdBlock" message and wouldn't work for me.

I'm more than happy to delete this trash off my computer, Mozilla should get rid of terrible plug-ins like this.

I will give a better star rating once someone tells me how to open excel on my cell phone s4. The app does not open to allow me to select where to view/edit a file.

I can work with excel files with this extension :)