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- 11.10.2009
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In general, the Firefox developers update to improve speed whenever a feature is well-tested and unlikely to cause errors. There's no hidden magic button that will triple your browsing speed. That said, experimenting with settings often helps. The most common cause of slowdowns is a buggy add-on, which this guide also covers.
Method 1
Changing Config Settings
Method 1
Changing Config Settings
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1
Update Firefox. Many optimization tweaks from the past are now included by default in Firefox. To take advantage of them, update to the latest version. This happens automatically when you check your version number.
2
Back up your preferences file. These settings can cause bugs and slowdown for some users. You can usually revert them without a problem, but back up the file just in case so you can restore your old preferences:- Open a new tab and enter about:support in the address bar.
- Look for "Profile Folder" and click Show Folder next to it (Show in Finder on a Mac).
- Go one level up from the folder that opens. You should see a folder with a string of letters and number, ending in ".default."
- Right-click this folder and choose "Copy," then right-click in a backup location and select "Paste."
3
Try one setting at a time. These settings are intended for advanced users, and could cause problems with your add-ons. It's best to change one setting at a time so you can test the effect.- You can find tools online to test the speed of your browser precisely.
4
Adjust connections per server. Your browser limits the number of simultaneous connections to a single server. Upping this limit will make a noticeable change to pages with many images or videos, if your bandwidth can handle it. Increasing this too much is considered bad etiquette, and may get you banned from a server, but you have a little wiggle room:- Search for network.http.max-persistent-connections-per-server and double-click the Value. Increase this to a maximum of 10.[1] Some users prefer 8 to be on the safe side.
- Search for network.http.max-connections. Set this value to 256, if it isn't already.[2]
5
Disable animations. Firefox displays small animations when opening or closing tabs. This is usually not an issue, but you can avoid some hang-ups if you tend to open or close many tabs at once:[3]- Set browser.tab.animate to False.
- Set browser.panorama.animate_zoom to False.