I have the same problem. Joomla 3.4.4. and PLAZART FRAMEWORK 4.6. Do not operate the most important functions Manager's template (for setting the style template). Does not work buttons:"Save" "Close" and "Help". It seems that you can set to change in the template, but they can not be permanently saved.
My template is Liona
Could you please send us your site and admin account via firstname.lastname@example.org.
We will check it on our Firefox to see if it works.
Then, you can make changes to your browser.
There might be problem with your Firefox.