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The intent is to make it the default for all Firefox users in the first half of 2017. As such, Mozilla will be testing multi-process support with add-ons starting in Firefox 49. Multi-processor support breaks some add-ons, especially those that modify content. By separating web content and Firefox UI processes, when a webpage is consuming a large part of your computer’s processor and memory, your tabs, buttons, and menus (hopefully) won’t lock up. Just like other browser vendors have concluded, Mozilla believes using a separate rendering process lays the foundation for significant performance and security improvements in Firefox. To check if you’re in the Electrolysis group, type “about:support” into the URL bar and check to see if it says “1/1 (Enabled by default)” under the Multiprocess Windows line item. In Firefox 48, Mozilla is slowly enabling multi-process support, starting with 1 percent of users, and ramping up to nearly half of the Firefox Release channel. Firefox Nightly gained multi-process support in November 2014. In fact, work to make the frontend and add-ons support multiple processes began in early 2013.

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Older versions of firefox from 40 download