Uploaded September 2025 | Updated September 2026, 2 weeks ago

---

Sponsored: Get your personal information removed from the web and search results by visiting ⇨ joindeleteme.com/ThioJoe and use code THIOJOE for 20% off

Tons of websites these days rely on JavaScript to work, and browsers have built in "compilers" to make this JavaScript code execute faster in most cases. But this extra step adds a lot of complexity and room for tons of exploits for hackers. In fact, around half of zero-day exploits are directly related to these "just in time" compilers they're called, and disabling that can greatly improve your protection against these potential exploits.

Firefox flags to set to false (bools):
• JavaScript JIT:
○ javascript.options.baselinejit
○ javascript.options.ion
○ javascript.options.jit_trustedprincipals
• WebAssembly JIT:
○ javascript.options.wasm
○ javascript.options.wasm_trustedprincipals
○ javascript.options.wasm_baselinejit
○ javascript.options.wasm_optimizingjit
• Asm.js JIT:
○ javascript.options.asmjs
• Blinterp (JIT-like)
○ javascript.options.blinterp

Time Stamps:
0:00 - Intro
0:20 - What is The Setting?
0:51 - The Setting Explained
1:30 - The Problem With JIT
2:19 - Technically Not Fully Disabling JIT
2:59 - The Trade-off
3:54 - Very good thing indeed
5:16 - The Setting in Chrome & Others
6:22 - Fully Disabling JIT in Chrome
6:46 - In Chromium Browsers Mobile Versions
7:20 - The Setting in Microsoft Edge
8:19 - Setting is Missing in Edge Mobile
8:29 - Firefox Instructions
9:21 - Can’t Do it in Firefox Mobile
9:31 - Safari Browser Requires Lockdown Mode