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In current versions of desktop Firefox, the entire browser runs in a single operating system process. In particular, the JavaScript that runs the browser UI (also known as "chrome code") runs in the same process as the code in web pages (also known as "content" or "web content").

Future versions of Firefox will run the browser UI in a separate process from web content. In the first iteration of this architecture all browser tabs will run in the same process, and the browser UI will run in a different process. In future iterations, we expect every browser tab to run in its own process. The project that's delivering multiprocess Firefox is called Electrolysis, sometimes abbreviated to e10s.

Normal web pages are unaffected by multiprocess Firefox. People working on Firefox itself and Firefox add-on developers will be affected if their code relies on being able to access web content directly.

Instead of accessing content directly, chrome JavaScript will have to use the message manager to access content. To help ease the transition we've implemented Cross Process Object Wrappers and some compatibility shims for add-on developers. If you're an add-on developer wondering whether you are affected, see the guide to working with multiprocess Firefox.

Multiprocess Firefox is currenty supported but disabled by default in Nightly builds. To enable open Options and check the 'Enable E10S (multi-process)' checkbox and restart. As a visual indicator that you're running multiprocess Firefox, the titles of remote tabs are underlined.

Technical overview
A very high-level view of how multiprocess Firefox is implemented.
A reference for the jargon used in multiprocess Firefox.
Add-on migration guide
If you're an add-on developer, find out if you're affected and how to update your code.
The message manager
How to communicate between chrome and content.
Why we're implementing multiprocess Firefox: performance, security, and stability.
Cross Process Object Wrappers
Cross Process Object Wrappers are a migration aid, giving chrome code synchronous access to content.
Compatibility shims
Shims that enable add-ons to keep working if they have not yet been updated to work with multiprocess Firefox.

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Ostatnia aktualizacja: Jacopo,