Add Wall of Browser Bugs entry for #19839 (#20026)

See https://bugzilla.mozilla.org/show_bug.cgi?id=1277782
Refs #19839

[skip sauce]

docs/_data/browser-bugs.yml

@@ -108,6 +108,16 @@
   origin: >
     Mozilla#1182856
 
+-
+  browser: >
+    Firefox
+  summary: >
+    Wide floated table doesn't wrap onto new line
+  upstream_bug: >
+    Mozilla#1277782
+  origin: >
+    Bootstrap#19839
+
 -
   browser: >
     Firefox (Windows)