General-purpose usage notes and tips
To allow root access, open the Developer options in the settings. There, press Root access. In the pop-up menu, select either Apps only, ADB only or Apps and ADB, depending on how you want to restrict root access. See ADB for more information about root access with ADB.
The mostly used barcode scanner app ZXing has a slow preview. The privacy-friendly QR Scanner has a faster preview.
Viewing videos in the gallery or in the browser is not possible. See #1539 for background information.
Only the VLC app is known to be able to play videos on Replicant. Make sure to disable hardware acceleration in the settings to prevent crashes.
VLC is currently disabled in the F-Droid repository because only outdated versions are available. You need to enable the archive repository in the repository settings to be able to install VLC from F-Droid.