New issue by paper42 on void-packages repository

https://github.com/void-linux/void-packages/issues/36294

Description:
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### System

* xuname:  
  *Void 5.16.11_1 x86_64 GenuineIntel uptodate rFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF*
* package:  
  *``firefox-98.0_1``*

### Expected behavior
When I click on the firefox icon on the dock, a firefox window opens, has the correct icon and I get a dot under the firefox icon on the dock which indicates that firefox is open.

### Actual behavior
When I click on the firefox icon on the dock, a firefox window opens, has the default icon and I **don't** get a dot under the firefox icon on the dock.
![image](https://user-images.githubusercontent.com/23639164/159674899-8a7b00bf-6a67-47bc-8372-81138bc36619.png)

This worked before b1265c886f263e8508c18389c011cfc757bd09c8 - firefox 98.0.
I tried using a .desktop file from arch, but it didn't help.

### Steps to reproduce the behavior
* install GNOME or probably any other (wayland?) DE
* install firefox
* start firefox

cc @Duncaen