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Hi John, Barring a more elegant solution, you could edit the .xhtml file that Firefox redirects to when it reaches a net error (you can view this by visiting the following "url" using firefox: *about:neterror?e=dnsNotFound*). The accepted answer here <https://superuser.com/questions/1792996/customize-file-not-found-page-in-firefox-114> explains where to find that .xhtml file, inside the omni.ja archive. I've attached a custom omni.ja archive you could inject, and examples of how it displays now vs how it used to display. If you plan to use this, please save a copy of the original omni.ja file that you need to overwrite! omni.ja <https://drive.google.com/file/d/1aExDyrFxdE0svkRZELAA2Zg03PHXtnwo/view?usp=drive_web> [image: Example.PNG] [image: image.png] Best of luck, Kaleb A. (Langara LIT Student) On Thu, Feb 8, 2024 at 1:10 PM Lolis, John <[log in to unmask]> wrote: > Prithee, might one of you be able to point me in the right direction with > regard to modifying a browser error message, specifically a DNS error/site > not found message? > > Here's the rub... in an effort to prevent use of our OPACs as public access > computers, I've modified their DNS settings so that they only look to > themselves for DNS queries. In their hosts file, I only added entries for > our catalog, our website and our museum pass reservation site. > > So this effectively prevents access to all other sites (unless of course > someone happens to know the IP address of another site). > > The problem is that the browser returns the DNS error/site not found > message, and there are no browser controls to go back since it's in kiosk > mode. We have a label advising patrons to press ALT← to go back to the > previous page, but what I'd like to do is use a hex editor to modify the > default browser error to communicate the same thing. > > So my question is, does anyone know where I can find those messages so I > can edit them? I've searched all sorts of Firefox files to no avail so > far. I'm not completely averse to using a different browser, although my > preference is to *not* use Chrome or Edge. > > I also realize that whatever string I replace the error message with, it > must be the same length (this brings back memories of working at Prodigy > and editing command.com in MS-DOS so that it would return Bad command, you > idiot!!). > > hmmm... as I write this, now I'm thinking of utilizing a redirect page of > some sort, one that displays advice to the patron, then returns to > wherever. > > Thanks much! > > John Lolis > Coordinator of Computer Systems > > 100 Martine Avenue > White Plains, NY 10601 > tel: 1.914.422.1497 > fax: 1.914.422.1452 > > https://whiteplainslibrary.org/ > > *“I would rather have questions that can’t be answered than answers that > can’t be questioned.”* > — Richard Feynman > < > https://click.fourhourmail.com/5qure95xkf7hvvo93wh2/7qh7h8h05vr4zrtz/aHR0cHM6Ly9lbi53aWtpcGVkaWEub3JnL3dpa2kvUmljaGFyZF9GZXlubWFu > >, > theoretical physicist and recipient of the Nobel Prize in Physics in 1965 >