[Bug 1870827]

[Jfkthame]

Comment on attachment 9139105
Bug 1495900 - Add fontconfig cache directories to content-process sandbox read paths. r=jld

### Beta/Release Uplift Approval Request
* **User impact if declined**: Long pause (jank) in Firefox as a result of starting up chrome (or possibly other triggers)
* **Is this code covered by automated tests?**: No
* **Has the fix been verified in Nightly?**: Yes
* **Needs manual test from QE?**: No
* **If yes, steps to reproduce**: On affected system, launch chrome while firefox is running, observe whether firefox pauses for a noticeable period. (Dependent on fontconfig version and possibly other aspects of system configuration.)
* **List of other uplifts needed**: None
* **Risk to taking this patch**: Low
* **Why is the change risky/not risky? (and alternatives if risky)**: Trivial, just whitelisting directory where fontconfig caches may be stored
* **String changes made/needed**:

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Title:
  Firefox hangs after simultaneously opening Chrome/Electron-based
  applications

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