This add-on could not be installed because it has not been verified. Error #118
Description
tried this on my Windows XP. told me, "This add-on could not be installed because it has not been verified."
I'm using Firefox, which is the last version that supports Windows XP (version 52.9.0)
is there any way I could at least install the addon, or do I need to install an older version of the addon?