Meta Bugs от Nicolas B. Pierron

When installed and enabled, this addon will:
 - Building a transitive list of bugs blocked.
 - Highlight in red fields which have to be set when triaging.
   * Priorities should be set.
   * Severity should be set to N/A for non-defects, and to some value for defects.
   * Block list of bug should transitively block Bug SpiderMonkey.
 - Replace file names of source files by links to searchfox when possible.
 - Query crash-stats to display bugs with similar signatures.

Source: https://github.com/nbp/meta-bugs