Remove Wall of Browser Bugs entry for #19390

Refs https://bugzilla.mozilla.org/show_bug.cgi?id=1217012
Refs #19393
[ci skip]

docs/_data/browser-bugs.yml

@@ -98,16 +98,6 @@
   origin: >
     Bootstrap#15990
 
--
-  browser: >
-    Firefox (Windows)
-  summary: >
-    Buttons in footer of very long Bootstrap modal not clickable in Firefox 33+
-  upstream_bug: >
-    Mozilla#1253468
-  origin: >
-    Bootstrap#19390
-
 -
   browser: >
     Chrome (OS X)