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Rated 3 out of 5 stars
"CHM Reader" could not be installed because it is not compatible with your Firefox build type (Linux_x86_64-gcc3). Please contact the author of this item about the problem.
I am using: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:188.8.131.52) Gecko/20091109 Ubuntu/9.10 (karmic) Firefox/3.5.5