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[Launchpad Bug Tracker <1485741@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package firefox - 40.0+build4-0ubuntu0.15.04.4

---------------
firefox (40.0+build4-0ubuntu0.15.04.4) vivid-security; urgency=medium

  * Disable geo-specific search defaults, and clean up profiles that have
    been inadvertently switched to the wrong search default (LP: #1485741)
    - add debian/patches/disable-geo-specific-search-defaults-for-us.patch
    - add debian/patches/cleanup-geo-specific-search-defaults.patch
    - update debian/patches/series

 -- Chris Coulson <chris.coulson@xxxxxxxxxxxxx>  Tue, 18 Aug 2015
15:06:51 +0100

** Changed in: firefox (Ubuntu Vivid)
       Status: In Progress => Fix Released

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https://bugs.launchpad.net/bugs/1485741

Title:
  Search defaults to Yahoo when it shouldn't

Status in firefox package in Ubuntu:
  In Progress
Status in firefox source package in Precise:
  Fix Released
Status in firefox source package in Trusty:
  Fix Released
Status in firefox source package in Vivid:
  Fix Released

Bug description:
  When Mozilla initially switched to Yahoo by default for US users, it
  did this with a non-localized geo-specific preference
  (browser.search.defaultenginename.US), used when the locale was en-US,
  the user was in a US timezone and Firefox was not a partner build.
  This meant that Ubuntu builds continued with Google as the default
  search engine.

  Some users are reporting that the default is switching to Yahoo after
  upgrading to 40.0, which is not intentional.

  Since http://hg.mozilla.org/releases/mozilla-release/rev/37ea9e22ac42,
  it looks like Firefox downloads a region specific default from a
  Mozilla server even for partner builds like ours.

  *Test plan for updates*

  - Ideally the testing will be done by somebody in the US. This can be
  done by people outside, but is a bit trickier.

  1) No customization
  a) Before updating, open Firefox with a clean profile. Verify that the default search is Google.
  b) Close Firefox and then reopen it. Verify that the default search engine switched to Yahoo.
  c) Close Firefox, install the update, reopen Firefox and verify that the default search engine is Google.

  2) Customized
  a) Before updating, open Firefox with a clean profile. Set the default search engine to something else other than Google or Yahoo (eg, DDG).
  b) Close Firefox and then reopen it to make sure the choice sticks.
  c) Close Firefox, install the update, reopen Firefox and verify that the default search engine is still the one you chose.

  3) Customized (Yahoo)
  a) Downgrade to Firefox 39, open it with a clean profile and set the default search engine to Yahoo.
  b) Close Firefox, upgrade to Firefox 40 (the unfixed version), open Firefox and verify that the default search engine is still Yahoo.
  c) Close Firefox, install the update, reopen Firefox and verify that the default search engine is still Yahoo.

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