No CSD (Linux client side window decorations) under Openbox, Arch Linux
I'm using Firefox under the Openbox WM on Arch Linux and I cannot enable CSD. As seen in the picture, the "Title Bar" customize option changes actually nothing. The WM's default window decoration remains visible and there's no change at all. This issue applies to all versions of Firefox since CSD was introduced, i.e. since v 60 (as far as I can recollect) till now. Is that a bug or am I simply missing something important? I've tried creating a completely new Firefox profile - same thing then. Other apps (like Evince or Google Chrome) show client side decorations properly in my case. Any kind of help will be highly appreciated, thanks in advance.
Additional System Details
- User Agent: Mozilla/5.0 (X11; Linux x86_64; rv:62.0) Gecko/20100101 Firefox/62.0
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