Currently a reload of content is required for text-size changes to take affect. I don't know which bug had the patch which made the unfortunate change; but I am creating this one for release note tracking.
Wasn't this a result of the patch in bug 763702?
(In reply to Martijn Wargers [:mw22] (QA - IRC nick: mw22) from comment #1) > Wasn't this a result of the patch in bug 763702? Partially. It was actually a result of changes made for bug 749186. But, this is tracked in another bug, bug 766599