[Bug][Firefox] Additive layer blending results in wrong colour in image export

[huntfx]

Describe the bug
When using the layer blending mode as "additive", going on "Share > Export Image" will sometimes result in the wrong colours in Firefox. Tried with Chrome and I was able to get a successful export each time.

For example, pink becomes purple and blue becomes green.

To Reproduce
Steps to reproduce the behaviour:

1. Upload a CSV file with point data in Firefox
2. Set blending mode to additive
3. Export the image

Expected behaviour
Exports with the correct colours.

Screenshots

Desktop (please complete the following information):

• OS: Windows
• Browser: Firefox
• Version: 128

[mars-dlx]

Tracked it to
src/utils/src/dom-to-image.ts:198

I found that the Red color component of result dots differs in Firefox and Chrome. Green and Blue are the same. I can assume this is some Firefox bug.