[tor-bugs] #30429 [Applications/Tor Browser]: Rebase Tor Browser patches for Firefox ESR 68

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#30429: Rebase Tor Browser patches for Firefox ESR 68
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 Reporter:  gk                                   |          Owner:  tbb-
                                                 |  team
     Type:  task                                 |         Status:
                                                 |  needs_review
 Priority:  Very High                            |      Milestone:
Component:  Applications/Tor Browser             |        Version:
 Severity:  Normal                               |     Resolution:
 Keywords:  TorBrowserTeam201907R, tbb-9.0       |  Actual Points:
  -must-nightly                                  |
Parent ID:                                       |         Points:
 Reviewer:                                       |        Sponsor:
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Comment (by acat):

 Not so important, but I was wondering whether it would be ok to do a last
 pass to fix style issues whenever we think we have a branch ready for
 nightly. I can do this, and it cannot take more than 1 day.

 I think almost all C++ style should be fine according to `./mach clang-
 format`, but I was thinking to also make the JavaScript code we add or
 modify obey mozilla style (ESLint rules). Many of the style issues can be
 fixed automatically. The rules are quite advanced and tuned to Firefox
 codebase, and sometimes they help fixing bugs (deprecated things in XPCOM,
 etc.). I saw this while working on torbutton integration.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/30429#comment:19>
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