Maintaining apps from iPad

I fear this should be obvious but why can I not maintain (e.g., add apps) from the browser (Safari or Firefox) on my iPad. This works fine from Firefox on the Mac but the left hand column which begins with “Your Apps” only appears on the Mac. Is this a documented limitation or is there some way to get to these features on the iPad?

I cannot answer this question to you, but it might be possible that iPads require a special handling to get data correctly displayed. It might be worse to create an issue ticket to get this checked/fixed.
Please make sure that you follow the issue template and provide as much information as possible about your system, software, iOS and browser versions and also a step-by-step description how the problem can be reproduced.