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The preferences defined on MDN page, "Setting up an extension development environment", as of January 27, 2016 are set up on install/enable of addon. A log of what was changed is shown.
On uninstall/disable of addon, the preferences are reset to "non-production environment" settings. A log of actions taken is shown.
Details of Preferences Changed to Enter Developer Environment
- nglayout.debug.disable_xul_cache - True
- browser.dom.window.dump.enabled - True
- devtools.chrome.enabled - True
- devtools.debugger.remote-enabled - True
- extensions.logging.enabled - True
- nglayout.debug.disable_xul_fastload - False (There is a warning on MDN page that warns this should never be set to true in a production environment)
- dom.report_all_js_exceptions - True
- devtools.errorconsole.deprecation_warnings - True
- devtools.debugger.prompt-connection - False
- xpinstall.signatures.required - False
- xpinstall.whitelist.required - False
- extensions.sdk.console.logLevel - "all" (Details: https://developer.mozilla.org/en-US/Add-ons/SDK/Tools/console)
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