Correction
Many Wikisource use a pr headers gadget in order to set an option that show by default the header and footer of pages of the Page namespace. This gadget set to true a JS variable used by proofreadpage extension. But, with RessourceLoader 2, this gadget is often loaded after extension JS, and doesn't work.
This patch solve the problem by adding a checkbox in editing preferences.
Version: unspecified
Severity: minor
Attached: