FireFox portable still writes data in the appdata folder
Also runs crash reporter by default.
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The folders in APPDATA are required while Firefox is running and should be removed on exit. If a specific one isn't in the current release, please file a bug report.
The crash reporter is enabled but writes to FirefoxPortable\Data\profile\CrashReports. It doesn't matter much as Firefox crashes are exceedingly rare these days unless someone is using a blacklisted video driver.
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