[tor-bugs] #21267 [Applications/Tor Browser]: e10s compatibility for Torbutton's content sizer

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#21267: e10s compatibility for Torbutton's content sizer
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 Reporter:  mcs                                  |          Owner:  tbb-
                                                 |  team
     Type:  defect                               |         Status:
                                                 |  needs_information
 Priority:  Medium                               |      Milestone:
Component:  Applications/Tor Browser             |        Version:
 Severity:  Normal                               |     Resolution:
 Keywords:  tbb-torbutton,ff52-esr,              |  Actual Points:
  TorBrowserTeam201702                           |
Parent ID:  #21201                               |         Points:
 Reviewer:                                       |        Sponsor:
                                                 |  Sponsor4
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Changes (by mcs):

 * cc: arthuredelstein (added)


Comment:

 Kathy and I spent some time looking at what it would take to make the
 content-sizer.js code work in an e10s environment. Unfortunately, it does
 not look like it will be a simple task and the existing code is
 complicated enough that it makes sense for Arthur to own this task.

 Most of the problems are inside the updateDimensions() function. All
 places where the code accesses gBrowser.contentWindow must be modified to
 get information using an alternative method, or we need to use a content
 script combined with Firefox's message manager from the chrome side to
 request the info we need (full screen state, zoom factor, content window
 dimensions). The necessary changes will be a little tricky because simple
 variable access must be replaced with asynchronous message exchanges.
 Kathy and I do not understand the existing content-sizer code well enough
 to be confident that we will account for everything correctly when we
 rearchitect the code in this way.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/21267#comment:7>
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