Updated Firefox versions in the landing page redirect tests (Bug 892716)

Added tests for the ESR builds also.
Merge pull request #214 from kyoshino/bug-892716-fx-ver-bump

Updated Firefox versions in the landing page redirect tests (Bug 892716)
Fixing redirects to /new when using Firefox UA
Merge pull request #215 from retornam/fixtestredirect

Fixing redirects to /new when using Firefox UA
Fixing test_redirect_landing
Merge pull request #216 from retornam/fix-redirects

Fixing test_redirect_landing