I just set up a server with linux Ubuntu 24.04 Desktop, with Firefox 129.0.2 included to do some dev and testing work. Problem: Firefox seems unable to see or open files that are above or outside the user's home dir tree. The only extra packages installed are the LAMP stack and Google Chrome, which has no problem. (had to have something for A/B testing.) I've tried entering the url of file:///var/www/index.html, I've tried selecting 'open with...' from the files app, etc. Nothing works. I can get to the file through http://localserver/index.html with no issues. I've verified permissions on the entire directory tree to the file. Everything from end to end has read permissions for all, 755. I've checked the following advanced settings: security.sandbox.content.level..............................0 (started at 4, now at 0, no effect or change.) security.fileuri.strict_origin_policy.........................false (default setting as installed.) I am able to open file:/// and get a dir listing. BUT, if I click on var, it gives "Access to the file was denied." I even tried changing the permissions on /var to 777, but no change. This seems to be a Firefox only problem, since Google Chrome works where firefox doesn't. I've spent several hours searching for ways to fix this, all with no success. Does anyone have any idea how to fix this, or even what to look at???