Hello, I had some problems with video codecs in IceCat 68.3.0-guix0-preview1. For example, consider this page: http://demo.nimius.net/video_test/. By default, the videos under the headings H.264 / AAC and MPEG4 don't work ("No video with supported format and MIME type found.").
The following steps make the first of these videos work: 1. Open about:config 2. Click "I accept the risk!" 3. Set security.sandbox.content.read_path_whitelist to /gnu/store/ (the trailing / is important). The instructions were originally sketched out in this help-guix message: https://lists.gnu.org/archive/html/help-guix/2019-12/msg00150.html I believe it would be beneficial to make this a default. On IRC, bandali suggested that it would be better to only whitelist the necessary store subdirectories. I don't know how to gather such a list, but it it seems like a good idea. I don't know how about:config entries modified by the user behave when IceCat is updated, but in some of the behaviors I can imagine, the config entry stops updating, in which case it would be better to add the paths to some internal whitelist (I reckon such a whitelist already exists and contains something like /usr/lib). Regards, Jakub Kądziołka CC: mhw as suggested by nckx
