Yes there are security implications too, but the article only looks at one side of it. When you’re using a browser heavy with extensions and/or tabs, it is usually the single process nature that slows you down. For that reason I would hesitate to even call the ability to draw more RAM per process an advantage in the first place, because the time I spent using Firefox both with the 32 and 64bit architecture didn’t show a discernible difference at all. This does require you to have that amount of memory available merely to keep the browser working the same as before – and if that’s not the case, then the switch will make the browser slower. The 64bit browser does not work automatically better than its 32bit variant, but it uses about a third more RAM for the same function and user experience anyway. I agree that using Firefox as a 64bit version means the browser *can* use more RAM, but in my opinion this is not necessary or advisable in most usage scenarios. Now You: Do you run a 32-bit or 64-bit version of Firefox? Firefox will be upgraded to 64-bit. You can verify that using the method mentioned above. Run the installer afterwards, and follow it through to the end. Make sure you close Firefox before you continue. It is indicated by a 64-bit icon on the download icon. Make sure you pick the 64-bit version for Windows. Download Firefox Stable, Firefox ESR, Beta, Developer or Nightly from Mozilla. Now browse to another folder on your computer, and use Ctrl-V to place a copy of it in it. Select profiles, press Ctrl-C to copy it to the clipboard. ![]() Go up two directories, so that you are in the main Firefox directory under the user folder. Note that this opens the profile that is in use at the moment. Type about:support, click on the show folder link to open it on your system. Second thing that you do is back up the Firefox profile folder. Don't worry though, Mozilla won't end support for 32-bit, but will just focus on distributing 64-bit Firefox over 32-bit in 2017 and later. ![]() If your system does not have one, you are stuck with 32-bit Firefox. Find the "system type" listing on the page, and check whether it says 32-bit or 64-bit. ![]() USe Windows-Pause to open the System Control Panel applet. First thing you do, is check if you can update Firefox to 64-bit.
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