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Rated 5 out of 5 stars
@ DOq455EnQOoIVpC on September 29, 2011
"install.rdf trick doesn't seem to work in this case."
Really? I modified the value '6.*' to '7.*' in the 'install.rdf', pushed the modified 'install.rdf' back into the latest 'Dictionary Search' .xpi, Installed the modified .xpi via the 'AddOns Manager|Extensions|Install AddOns from File...' and it worked for FF 7.0 installed on both my Desktop and my Netbook. (Anyone unsure of what I'm typing about here should do a Search for: "modifying .xpi" with their favorite search engine.)
Ubuntu 10.04.3 LTS