Standalone not accessible from firefox connector
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"No hay aplicaciones instaladas para abrir este tipo de vínculo (zotero).
Encontrar une aplicación en la Tienda"
(The second sentence is an option you can click on, and there is an icon with a bag and the Windows emblem printed in the bag)
Can you try re-installing Zotero for Firefox from http://www.zotero.org/download/ ?
Edit: your data/library will not be overwritten
Relative to Metro:
I close Firefox, I open it again form the desktop. There is no change.
For more info, Windows failed and restarted itself some hours before I realized that Zotero didnt work. It is possible that it changed some values of Firefox or Windows.
I can re-instal zotero for Firefox. By the last sentence are you saying that I wont lose my data? If it is sure, I can try it. But I should be 100% sure. Losing this data would be a big problem :/
I dont find the file pointed out in the link you attached.
I don't want to bore you asking for help in saving the data.
I will look for the file tomorrow morning with anyone more expert than me and save all the data before reinstalling zotero.
I will tell you how did it go.