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I currently have Firefox set up so that a persistent cache is not stored after closing Firefox. I only have the memory cache enabled which it empties when Firefox is closed.

Sometimes I need for security reasons to empty the memory cache but it is very inconvenient to restart Firefox, but I am currently forced to.

So I was wondering if there is a way to empty Firefox's cached items in memory while Firefox is still running and without causing any problems? If this is possible without causing issues in Firefox, then I would also like to know if this would be in any way less effective than closing Firefox and have it empty the memory cache the normal way?

I am running Ubuntu GNOME 16.04 with GNOME 3.20 and Firefox 47.

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Official Mozilla Support Answer

Mozilla has a support document for this particular question.

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The document offers additional information - so it is worth a look.

It also says that clicking the Clear Now button could take an unknown amount of time to clear all the caches (and it does clear all of them including the memory cache you want to clear) because it is done in the background by another processor thread. Though you can check how it's doing by going to the about:cache page.

Alternative: Using Add-On

You could use an add-on to delete the cache.

As far as I know there are several, I always used Empty Cache Button.

enter image description here

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Can yoy not press Ctrl + F5 like you can for chrome.

  • If you have a new question, please ask it by clicking the Ask Question button. Include a link to this question if it helps provide context. - From Review – Videonauth Jun 15 '16 at 6:05
  • Was not a question it was a form of answering the original question posed. Thus the reason a question mark was not added at the end of the sentence. – unknown user Jun 15 '16 at 7:28
  • @unknownuser: Doesn't that just clear the cache for the page you are viewing rather than the entire one? I thought it did... – user364819 Jun 15 '16 at 16:12
  • My understanding was that it did the whold session. – unknown user Jun 15 '16 at 23:56

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