Ajax Request not working properly in firefox (saving drafts, extended macros, page templates)

In Conquest 5.9.10 several ajax features doen't work correctly in firefox 46. In Chromium it works fine.

Not working includes:

• saving drafts
• creating a page with a predefined template
• inserting an macro from the complete macro list

In an older Version of confluence those functions worked fine on the same enviroment