Windows: Fails to run functional tests in Firefox

[dmlemeshko]

Breaking change for Windows came with the following commit: 401fa13

How to reproduce:

1. Start Kibana server node scripts/functional_test_server
2. Run functional tests with node scripts/functional_test_runner --config test/functional/config.firefox.js

Firefox browser is not started, the following error occurs:

debg [webdriver] Creating session
 debg [webdriver] Creating session
 warn Failure loading service "__webdriver__"
ERROR Error: remote failed to start within 2 minutes
          at Promise.race (C:\Users\LeeDr\git\kibana\test\functional\services\remote/webdriver.ts:247:13)
 warn Failure loading service "find"
ERROR Error: remote failed to start within 2 minutes
          at Promise.race (C:\Users\LeeDr\git\kibana\test\functional\services\remote/webdriver.ts:247:13)
 warn Failure loading service "browser"
ERROR Error: remote failed to start within 2 minutes
          at Promise.race (C:\Users\LeeDr\git\kibana\test\functional\services\remote/webdriver.ts:247:13)
ERROR Error: Failure initializing 3 service(s)
          at ProviderCollection.loadAll (C:\Users\LeeDr\git\kibana\packages\kbn-test\target\functional_test_runner\lib\providers\provider_collection.js:60:13)

The issue is not reproduced on MacOS and Linux

[jsanz]

@dmlemeshko is this issue still valid? changing tags triggered the bot to add the needs-team, so it got in to the community duty triaging :)

[elasticmachine]

Pinging @elastic/appex-qa (Team:QA)