We already have two reftest screenshots directly in the html log. It would be nice to be able to click the picture, and have a in-page reftest analyzer poping up.
A quick workaround would be adding a link to the original reftest analyzer. We can reference how Treeherder's try result does it.
As to the link, you might want to use the in-tree version of analyzer: https://hg.mozilla.org/mozilla-central/raw-file/tip/layout/tools/reftest/reftest-analyzer.xhtml instead of the one you mentioned in bug1256276 comment 0.
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