[Linux] Transparent context menu

[IckyVickyUwU]

Before reporting your issue

• My version of Firefox is up to date (for 115, this means being on at least 115.16.1)
• My copy of Geckium is up to date (no update option in the hamburger/spanner menu)
• I deleted the entire "chrome" folder from my Firefox Profile, if there was one, before installing Geckium

What browser are you running Geckium on?

Mozilla Firefox ESR

What Operating System are you running Geckium on?

Arch Linux

Summarise the issue

For some reason, the context menu is completely transparent while using Geckium and there is no way to change that, changing themes and styles does not make any sort of effect for this issue.

Screenshots

How do you reproduce the bug/inaccuracy?

1. Open browser
2. Click with the left mouse button anywhere else?

Expected behaviour or design

Not being transparent.

Additional Context

No response