[css-d] Live and local versions of same web site showing as different width in Firefox

I have recently switched to Firefox Developer Edition (61.0b4) for developing my web sites. I have a local Apache server on my desktop computer which I use to view sites under development. The live site is hosted on a remote server under my control at my ISP. I am puzzled that the live version

Re: [css-d] Live and local versions of same web site showing as different width in Firefox

> On May 20, 2018, at 3:27, Tim Dawson wrote: > > I am puzzled that the live version of my site appears about 11% narrower in > Firefox than the local version, even though the CSS files are identical in > all relevant respects. The sites are in the same browser window, but on > different tab