see question above and help me please... it's slowing down my computer.
The figure may not necessarily be high depending what you are doing with firefox. Do you know how much RAM is installed on your computer ?
The report is apparently being generated by AVG software, you will need to consult the AVG manual or its faq/site/forum if you want to turn off such notifications.
Note if you go to about:memory in the firefox location bar it will generate a report that you may find useful. See also Firefox uses too much memory (RAM) - How to fix
Please refer to https://support.mozilla.org/en-US/questions/900255 for a solution to this "problem".
Hope it helps.