'Enable Pipelines' checkbox in repository Settings is not visible from Firefox (BB-16167)

Summary

'Enable Pipelines' checkbox in repository Pipelines Settings is not visible from Firefox

Environment

Tested with Firefox 47.0.1

Steps to Reproduce

1. Sign up for Bitbucket Pipelines
2. After you are granted access, open a repo under your account with Firefox
3. Go to Pipelines from the sidebar
4. Select Set up Pipelines

Expected Results

Pipelines Settings page opens, with the option to enable Pipelines for the repo:

Actual Results

The 'Enable Pipelines' checkbox is missing in Firefox:

Workaround

Use Chrome instead