Re: Firefox and Cliqz tabs crashing at GOV.UK government pages

On Sat, 11 Apr 2020 09:49:09 +0300
Alexandr Krivulya <shuriku_at_shurik.kiev.ua> wrote:

> 11.04.20 03:34, Graham Perrin __________:
> > On 08/04/2020 20:23, Graham Perrin wrote:
> >  
> > > Firefox 75.0_1,1 tabs crashing or mis-rendering at some www.gov.uk   
> > pages  
> > >
> > > Most noticeable today at <https://www.gov.uk/coronavirus>.   
> > Screenshots available on request.  
> > >
> > > AFAICT the same types of problem with 75.0_1,1 on both r357746 and   
> > r359628.
> >
> > The problem persists with r359750, is reproducible with a different 
> > user account, is reproducible with Cliqz browser. As far as I can 
> > tell, only bugging UK.GOV government pages.
> >
> > Occasionally a page will appear OK (e.g. the screen to the left at 
> > <https://i.imgur.com/ROO9FIN.png>), more often the page will appear 
> > wrong (screen to the right, safe mode).
> >
> > Most often: the tab will crash before the screen can be read. Crashes 
> > seem to occur at load time, towards the tail end of content loading or 
> > rendering.
> >  
> 
> I can't reproduce it on my current (r359770, amd64, firefox-75.0_1,1), 
> this page loads fine, no any mis-rendering or crashing.
>

https://www.gov.uk/coronavirus works with r359798 also, of course.

I tried it with r359740 using firefox with a java script blocker installed.  The
site displayed just fine and only complained about cookies.  As soon as I
enabled any one of the two blocked java scripts the tab crashed. Seems
like the site is using some weird java scripts which tickle a bug in
older versions (< r359770) of FreeBSD.

-- 
Gary Jennejohn