How to enable insecure download in Firefox while running parallel cypress tests using cypress-parallel?

[fardin-hossain-oyon]

I am running multiple cypress spec files in parallel using 'cypress-parallel'. I added the following commands in the 'scripts' section of the 'package.json' file in my project:

"scripts": {
    "parallelizationTest": "npx cypress run --headed --config-file ./cypress-my-config.js --browser firefox",
    "cy:parallel": "cypress-parallel -d cypress/e2e/ParallelizationTest/test/ -t 9 -s parallelizationTest"
  },

Then I am running my test using npm run cy:parallel command.

Now, the problem is, in my tests, some files need to be downloaded from an insecure website (http://) but firefox does not allow these downloads saying insecure download is blocked. I tried changing the dom.block_download_insecure to false in Firefox's about:config section but it doesn't change anything.

The interesting thing is, when I run my tests without parallelization, the downloads are not blocked. The issue only happens in parallel tests.

Can anyone give me a fix for this issue?