mozilla/affiliates — comment on commit e6dd1ded8bb3b47113115faacaa07f7aae71fe63
File:  line 0
By Osmose:

The escaping happens to subcategory_name when it is output, like all jinja variables. The span tags that actually appeared were a part of the subcategory name (because they were used for style at various points of one word in the phrase), like "Firefox for Mobile".