The Historic Houses Association (www.historichouses.org) site has an option to show a map of interesting places. When I view this map in Firefox on Android or Windows 11, the icons show up correctly. For instance in the example map, next to Lincoln. In Android/Windows the icon shows a small castle in a drop pin while here in a Linux desktop it just shows a cross hatched box. The link to the web page still works. The roads in the Android/Windows versions correctly show A1, A46 etc. But here in Linux, you can just make out the road numbers behind the vertical hatching. Over a long period I have seen this has occur on a number of sites but I think that the maps are probably (cannot prove it) Mapbox/OpenStreetMap. But when I look at OpenStreeMap it self, the Road Numbers are fine and when I add a layer involving tags, they show as normal.
I know I could address this inquiry HHA but they will simply say 'they do not support Linux'. The site works in other environments so why not Linux? Also, as I have said, it has occurred on other sites in the past (though I must admit I cannot remember which ones and when - I tried a few while writing this support request) Is it likely that the web pages are being downloaded with a catalogue of Icons but this fails in the Linux version of Firefox? Would this account for the road numbers being corrupted as well?
The PC is running a fairly new (last 10 days) installation of Linux Manjaro with Mate desktop. However, this has been happening for some time (a couple of years) during which time, I have used Linux Mint, Debian and Manjaro, with Mate and Gnome desktops. Firefox is used as provided by Linux Manjaro, including Noscript and Adblocker - I have tried viewing this page with both disabled. The only changes I have made to Firefox settings is to enable 'when you open a link .... switch to it immediately', 'search for text when you start typing' and set 'browser.tabs.closeWindowWithLastTab' to false.
I have put up with the problem because it only affects me, however I am about to load Linux Manjaro on to computers for other less computer literate/tolerant people who will be using similar maps. It would help them if I could get a fix.
Thanks for your time
Alle svar (2)
Maybe you have enabled "Resist Fingerprinting" on the Linux device. That causes canvas content to get scrambled.
Well done, cor-el. You got it first time - thank you.
I have looked at the fingerprinting reference you provide and using the icon next to the address (rather than about:config) I have temporarily changed the setting for just this site. I have also now found one of the other sites where this occurs. I would 'trust' both sites. If I open these sites in a container and then set each one to ignore fingerprinting, do I open up the rest of Firefox to any further dangers, or are all other sites protected by both the site setting and the container. Thanks again