Describe the bug
Text does not display on Firefox based browsers, but they do display on Chrome browsers.

To Reproduce
Have a look at: https://design.penpot.app/#/view/441c1550-c424-11eb-8557-f55ab9adbb41/d0e73e20-e124-11eb-a77a-195c36c76d76?token=42eqNw4QBfdJNSiw-eeueg&index=4

On Chrome, the text in the menu is white-ish. Try to open the same link on a Firefox based browser (whether Firefox on desktop or or smartphones or Opera), and the text will not display. This isn't the only artboard where this happens, all artboards are affected. Some text is not affected but most text (created via the text tool or by reusing components from the Penpot Design library) is.

Expected behavior
Text should display.

Screenshots
If applicable, add screenshots to help explain your problem.

What should display and is displayed on Chrome:

What it shows on Firefox:

Desktop (please complete the following information):

• OS: Windows 10, Android 9
• Browser: Firefox based browsers (Firefox desktop, Firefox mobile, Opera Touch on mobile)
• Version: latest

Smartphone (please complete the following information):

• Device: Huawei P10
• OS: Android 9
• Browser: Firefox based browsers (Firefox mobile, Opera Touch on mobile)
• Version: latest

Environment (please complete the following information):
SAAS