Original Bootstrap issue: https://github.com/twbs/bootstrap/issues/19626 Affected Platforms: OS X, Linux (Doesn't seem to affect Windows) Simplified testcase: https://jsbin.com/heloge/edit?html,css,output Original testcase: http://jsbin.com/qekubi/1/edit?html,css,output Steps to reproduce: 1. Open the testcase in Firefox 47. Expected results: There should be no bottom border line on the active tab in either set of tabs. (Which is how Chrome, Safari, and MS Edge render the testcases. See attached Chrome screenshot.) Actual results: There is a thin bottom border line on the active tab in the 1st set of tabs. See attached Firefox screenshot. More info: The bug only occurs when the `<span class="badge">1</span>` is present
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