Two new versions of Firefox were uploaded yesterday to the Firefox ftp server and website. Firefox 3.5.4 and Firefox 3.0.15 are now available. The automatic update in the web browser should have already recognized the new version and suggested an update to the user. Users who prefer manual updates can visit the Firefox website over at Mozilla to download a version for their operating system and language directly.
The Firefox 3.5.4. release notes classify the update as a security and stability update making it an recommended update for every Firefox user. The full list of fixes and changes lists a total of 124 items with seven marked as critical and 13 as major. The Firefox 3.0.15 release notes list fewer items but still mention several security and stability fixes for that version of the web browser making it a recommended update as well.
It should also be noted that Firefox 2.x is no longer supported by the developers who ask users to update to the Firefox 3.x branch as the older branch contains known security and stability issues that are not (and will not be) fixed.
Both Firefox 3.5.4 and 3.0.15 are available from the Mozilla firefox website.

Firefox 3.0.1 released
Firefox 3.5.5
hi,
i’m using firefox 3.5.4
and i’m experiencing high memory consumption and slightly lag in later time..
even though i close the firefox…
it’s still appears in Task Manager process list with memory usage approx 400k..
i need to ‘kill’ the firefox.exe process in order to completely close the app..
just wonder..is this version havin prob with memory leak or is it just me? :p
I get the same behavior. Mem usage is task manager goes upto 1GB and CPU to 40%.
I wonder if it is firefox or one of the buggy plugins/addons I have.
The easiest way to find that out would be to create a new profile and run Firefox using that profile. If it still shows the behavior its the browser itself, if not it could be one of the add-ons or something else, maybe even a corrupted database.
I have just upgraded to 3.0.15 and fireftp no longer works so I am having to use DOS ftp which thankfully still works.
Portable Firefox is now updated, too:
http://portableapps.com/news/2009-10-28_-_firefox_portable_3.5.4
I too am having memory problems with Firefox 3.5.4 on Mac OSX. Its responsiveness slows down drastically. When I quit and restart, it has low memory footprint and is responsive again. I’m using Firebug too. Looks like a classic memory leak to me.
“…the older branch contains known security and stability issues that are (and will not be) fixed.”
I think you mean issues that *aren’t* (and will not be) fixed.
thanks fixed it
I had the slow down in 3.5.4 to. Removes 3 plugins and the problem was gone. I removes Sage, Power Twitter and …..an other Firebug.
FF starts up fast now and accessto pages is faster the shutdown of ff is also faster now.
I guess everthing has to do with the plug ins. I didn’t need them any more so I could remove them.