[tor-bugs] #21431 [Applications/Tor Browser]: Clean-up system extensions shipped in Firefox 52

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#21431: Clean-up system extensions shipped in Firefox 52
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 Reporter:  gk                              |          Owner:  tbb-team
     Type:  task                            |         Status:  new
 Priority:  Medium                          |      Milestone:
Component:  Applications/Tor Browser        |        Version:
 Severity:  Normal                          |     Resolution:
 Keywords:  ff52-esr, TorBrowserTeam201702  |  Actual Points:
Parent ID:                                  |         Points:
 Reviewer:                                  |        Sponsor:
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Comment (by mcs):

 Kathy and I looked at the various system extensions that are present on
 Mozilla's current beta branch (52). Here is what we learned about each of
 them:

 '''aushelper'''
 Modifies app.update.url default pref value to include info for bug 1296630
 The add-on only has an effect on Windows.
 See https://bugzilla.mozilla.org/show_bug.cgi?id=1311515

 A similar issue for WebSense was handled via the "HotFix" add-on.
 See https://bugzilla.mozilla.org/show_bug.cgi?id=1298404
 and https://hg.mozilla.org/releases/firefox-
 hotfixes/file/tip/v20160826.01/bootstrap.js
 This revision of the HotFix add-on only has an effect on Windows.

 There is a bug open for moving the WebSense update URL modification code
 into the aushelper add-on:
 https://bugzilla.mozilla.org/show_bug.cgi?id=1329692

 '''disableSHA1rollout'''
 Disable SHA-1 based certificates for 10% of beta channel users.
 See https://bugzilla.mozilla.org/show_bug.cgi?id=1328718

 '''e10srollout'''
 Enables e10s for a subset of users based on policies that account for
 which update channel the user is on, which add-ons are installed, etc.
 See https://bugzilla.mozilla.org/show_bug.cgi?id=1249845

 See also toolkit/mozapps/extensions/internal/E10SAddonsRollout.jsm

 '''flyweb'''
 Only included in Aurora and Nightly builds.
 Internet of Things related. See https://flyweb.github.io/

 '''formautofill'''
 Only included in Aurora and Nightly builds.
 Form Autofill. See https://bugzilla.mozilla.org/show_bug.cgi?id=990176

 '''pdfjs'''
 JavaScript-based PDF viewer.

 '''pocket'''
 Pocket client.

 '''webcompat'''
 Empty / stub extension to allow webcompat fixes to be deployed via the
 add-on update mechanism.
 See https://bugzilla.mozilla.org/show_bug.cgi?id=1268197

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/21431#comment:3>
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