How Did Facebook Silence the Developer Console Despite Chrome's Limitations?

Facebook's Stealthy Defense: Neutralizing Developer Tools

Despite the belief that disabling the browser's built-in Developer Tools is a technical impossibility, Facebook has defied this notion. To combat rampant scams and malicious account hacking, Facebook has instituted a daring solution.

How Facebook Achieved the Impossible

Facebook's approach involves intercepting all console commands through code snippets wrapped within a specialized Chrome function. By modifying this function, Facebook effectively renders any console input null and void.

Technical Details

Chrome encapsulates console commands within the following structure:

with ((console && console._commandLineAPI) || {}) {
  <code goes here>
}

Facebook ingeniously redefines the console._commandLineAPI property to trigger an exception:

Object.defineProperty(console, '_commandLineAPI',
   { get : function() { throw 'Nooo!' } })

While this alone does not entirely block the console, it forms the core of the defense mechanism.

Security vs. Functionality

While client-side hacking measures can be problematic, Facebook's strategy specifically targets social engineering attacks where users unknowingly execute malicious JavaScript code in the console.

Epilogue

Despite Facebook's innovative approach, the Chrome team classified it as a bug and reversed the capability. However, Facebook implemented additional safeguards to protect users from self-xss vulnerabilities.

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