firefox-legacy-1.16.4.28

Change

• Backport several improvements and fixes from the upstream (thanks to @hawkeye116477)
  • Add fixes for search functionality from upstream
  • Fix the handling of pseudoclass-based generic cosmetic filters
• Update and add new scriptlets and resources from the upstream
  • Better handle Request argument in no-fetch-if
  • Add resource for noop VMAP
  • Add ability to linger for remove-attr scriplet
  • Improve neutered adsbygoogle scriptlet
• Fix svg icons in redesigned dashboard on Gecko 45-51

Note: The release notes are created/maintained by @JustOff.