Following are few tweaks that you can perform on your firefox browser to reduce its memory usage.
One of the primary reasons of Firefox slowing down is due to large number of installed extensions. We are tempted to try out each and every fancy add-ons and these could slow down Firefox. Few things to take care while installing and using add-ons
You can also check Firefox memory usage by opening Firefox in safe mode by disabling all add-ons. To open in Safe mode, either you can select it from the programs menu or type firefox -safe-mode in run command.
Memory usage can increase and Firefox can slow down or hang if the download history is allowed to accumulate. Clear the download history (you may need to exit Firefox and delete the file “downloads.rdf” from the profile folder in some cases) and change this setting to circumvent the problem:
Tools -> Options -> Privacy -> Download History -> Remove Files from the Download Manager, select: “Upon successful download”.
Firefox comes with an option by which we can configure Firefox to reduce its memory usage when it is minimize. Following is the procedure to configure firefox to release memory when minimized.
Every time new page is loaded, Firefox will cache the page so it doesn’t need to load again to be redisplayed. By default, this setting is set to -1 for browser.cache.memory.capacity and to a number you specified in Tools -> Options -> Advanced -> Network / Cache for browser.cache.disk.capacity
To fix your cache to a certain value the browser.cache.memory.enable and browser.cache.disk.enable needs to be True for this to work
Set both browser.cache.memory.capacity and browser.cache.disk.capacity to 0.
Alternatively, you can also set browser.cache.disk.enable and browser.cache.memory.enable to False.
If you are using Firefox for long hours, then its advisable to restart Firefox periodically as Firefox memory usage increases when kept open for long hours. You can use the session restore feature in to bring back all the windows after restart.
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Good info but I wouldn't recommend turning off the browser cache. It will slow down page load noticeably. FF cache stores small files (images, css, js) individually and reuse them in the subsequent requests. Memory cache can reduce page load time a LOT if a HTML includes the same image (say space.gif) over and over.