This add-on is installed silently by Softonic installers (see URL). It's crapware that linkifies random text on web pages, with on-hover ads and possibly new unasked-for tabs from time to time. ID: firstname.lastname@example.org I have a copy of the XPI if needed.
What does it do that merits blocklisting?
The silent install. It bypasses about:newaddon
Sorry for the bugspam. Changing dependency chain to cut down some.