Re: firefox is slow and uses a lot of memory

From: RW via freebsd-hackers <freebsd-hackers_at_freebsd.org>
Date: Sat, 03 Jul 2021 15:30:52 UTC 
On Sat, 3 Jul 2021 10:03:36 +0200
Gary Jennejohn wrote:

> On Fri, 02 Jul 2021 20:03:04 +0000
> "Poul-Henning Kamp" <phk@phk.freebsd.dk> wrote:
> 
> > --------
> > Craig Leres writes:  
> > > Starting with firefox 89 or so, I've found it starts using a LOT
> > > of memory and actually makes the system sluggish and causes
> > > momentary X freezes. I have 32G of ram/swap, is it reasonable for
> > > firefox to use 15G?    
> > 
> > I noticed recently that firefox had started DNS's all bookmarks
> > rather aggressively I found something under about:config which made
> > it stop, (sorry cant remember which setting) but that made it at
> > lot more workable for me.
> >   
> 
> Another possibility would be to enter about:networking#dns.  A button
> "Clear DNS Cache" will appear.  Click on that and check whether that
> reduces the amount of memory being used by firefox.

There's something deeply wrong if prefetching DNS like that causes high
memory use.