I have read through a bunch of sites, but I could only find the right permission to set to existing files and folders, but I could not find anything related to the new files and folders to be created.

Whenever I create a new file or folder they will be created with permissions `660` and `770`, so some of the contents are not accessible. For example if I install a plugin, it will be installed with `770` and `660` permissions, so I get a `403` error through the javascript console for all assets of the plugin.

Is there a way/plugin, to adjust persmissions to the files and folders to be created in the future, not just the existing ones?

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> Please note:
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> * I don't have SSH access (or any access, but FTP) to the hosting
> server.
> * Disabling all themes & plugins doesn't solve the problem.
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>