Just change the maxversion Rated 4 out of 5 stars

The usual trick seems to work.

>>Download *.xpi file
>> Rename *.xpi.zip
>>Extract install.rdf
>>Edit maxVersion to. 5.0*
>>put back in zip file
>>rename back to *.xpi
>>install

Seems to be OK.

This user has a previous review of this add-on.