[packages/seamonkey] Non-fast-forward update to branch DEVEL-2.53

[qboosh]

The branch 'DEVEL-2.53' was changed in a way that was not a fast-forward update.
NOTE: This may cause problems for people pulling from the branch.

Commits removed from the branch:

  4cad6ef... - started update to 2.53.4 - updated pld-branging,enable-ad

Commits added to the branch:

  6930f27... - started update to 2.53.4 - updated pld-branging,enable-ad