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Is there a way to configure Firefox to use all available cores when opening a list of bookmarks?

For example, if I open a list of 10 bookmarks in one go, I would like Firefox to use all 4 cores available in my Ubuntu 12.04 32-bit laptop to speed up the rendering of the pages. But it seems like the only 1 core is used of the processor use in the System Monitor Widget.

Do I need to explicitly configure this in any way? According to Google, Firefox got multi-core improvements in the last 2 years. I am using version 19 but also downloaded version 20, so far with same results.

PS: I am not sure if this question is Ubuntu or Linux-specific, so if it is generic enough to Firefox that would make it more adequate to go to or elsewhere, please let me know.

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Most "advanced" configuration settings are available via about:config. (Just for completeness, this is accessed by typing about:config in the address bar, pressing Enter and accepting the caution.)

Now, the about:config page itself has a filter field: when I typed core in there, all I got was services.sync.globalScore;0. When I typed cpu, I drew a blank. And this is with Firefox 20 on a humble Dell Inspiron 1545 dual core machine.

If you can think of something more suitable to type into about:config, do try. There are additional custom entries that can be made in about:config but you may have to ask in mailing lists such as support-firefox -- Firefox help community or dev-apps-firefox -- Development discussion about Firefox for help on such advanced options. See Mailing Lists for more.

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