Thé "Blame" tool should use https and not http specially when called from hîstory pages.
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Topic on Talk:XTools
I'm assuming you're referring to links coming from the wiki. If so, you will need an administrator on that wiki to change the protocol. However note that XTools (as well as all WMF Cloud Services tools) only operate over HTTPS. Attempting to use HTTP will simply redirect to HTTPS.
In fact it is a tool appearing in the header of all history pages in many wikis (english and french wikipedia) calling directly "wikipedia.ramselehof.de/wikiblame.php".
I don't know where it should be said (many wikis).
That is WikiBlame, not XTools. XTools Blame is at https://xtools.wmflabs.org/blame. WikiBlame does not support HTTPS, and only the maintainer, Flominator, can fix that.