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Hey rharmelink,,,

"It's usually about 2.5GB of memory usage where FireFox crashes on me. When I restart, it's only using about 400MB or so (with my four standard tabs open). But I have times when I have 50 or more tabs open.

FireFox v28 only rarely used more than 1GB of memory."

Well you didn't tell us what OS/Version you are using, Windows, Linux, Etc., and on what kind box it's running, and with how much RAM, etc.

However, I think that those Memory/RAM usage numbers for Firefox are way out of line, and I don't believe this is pure Firefox problem, you have something else going on in that BOX.

I'll give you some examples of my Win-7/64-Bit/Pro Desktop's RAM usage numbers, with various Browsers. My Desktop Processor is 6-Core, AMD-Phenom-II X6 1100T 64/Bit @ 3.3/Ghz, with 8/GB RAM, and a 7200/RPM disk drive. It's a pretty responsive Box, but it's not a Gaming-Machine by any means.

When I load Firefox/V30, with a Single-Blank-Initial-Page, no internet access required, it uses 142.644K/RAM, With 15 Tabs(or New Windows) Open, it uses or grows to 387,176K/RAM, and with 20 Tabs(or New Windows) Open, it uses or grows to 470,464K/RAM.

So then, I opened 4 Browsers, with 20 tabs open, in each one, Google-Chrome, Iron-Chrome, I.E./V-10-64/Bit, and Firefox/V30. Besides, having Thunderbird, BitDefener-Pro/AV In-RAM Scanning Real-Time, MalwareBytes-Pro In-RAM Scanning Real-Time, TeamViewer, KeePass, Karens-Replicator, and a bunch of various In-RAM Utilities running, a total of 146 Processes running, and a total of 80 Browser Tabs Open, I still have around 3/GB of RAM available, so the System is now using 5/GB of the 8/GB total that I have. Also, I don't see any performance degradation at all, there in fact probably is some, but I don't see any as an External User!

Also, Firefox allocates new Context-RAM for each TAB (or New-Window) and just Grows the Original Process in size.
The other Browsers, Google-Chrome, Iron-Chrome, I.E./V-10-64/Bit all create a new Child-Process and allocates RAM for each instance.

The RAM usage for those 4 Browser are relatively close. In just Eye-Baling the numbers, looks to me that I.E./V-10-64/Bit and Firefox use slightly more RAM, but none of that is significant.

So anyway, those numbers should give you some sort comparison point, and yes, you mileage will vary.

Also, all those numbers, that I used, come from the Process-Explorer, and not the Windows Task-Manager. Windows Task-Manager numbers are not that accurate, it doesn't account for a processes' various working set allocations, etc.

As an example, right now I have the Process-Explore showing Firefox at 470,464K/RAM and the Windows Task-Manager is showing it at 413,804K/RAM, with nothing changing. However, Windows Task-Manager number will work fine as Ball-Park numbers!!!

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