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|User since||September 28, 2011|
|Number of add-ons developed||0 add-ons|
|Average rating of developer's add-ons||Not yet rated|
You have an extra closing tag in the firesizer.xul file.
Either get rid of the <"/>" or <"/menupopup>" after the opening <"menupopup>" tag.
- Extract the .xpi using something like 7-zip
- Open 'install.rdf' and change maxVersion under <!-- Firefox --> from 6.* to 7.*
- Save the file then add back to the .xpi
- Install add-on from file