Fix BrowserStack CI or find a replace

Prerequisites

• I have searched for duplicate or closed issues
• I have validated any HTML to avoid common problems
• I have read the contributing guidelines

Describe the issue

As browserstack ci fails at 98% of the runs, we must find a way to fix it or to replace it, as now we are used to ignoring it by default.

Reduced test cases

Almost all the PR CI runs

What operating system(s) are you seeing the problem on?

Linux

What browser(s) are you seeing the problem on?

Firefox, Opera

What version of Bootstrap are you using?

all