Leaderboard

It’s worthwhile. In heavy front end impacts, heavy fire extinguishers have popped out of there mounting frames before now. Trouble is, they then often have a lot of momentum, and shoot forwards, bounce off the dash or screen, and come right back at the passenger or driver! One of those ironic injuries, survive the crash unharmed, then end up brained by your own extinguisher! You can buy general purpose Velcro straps off eBay. They’re then easily enough adapted. Not the clearest of shots, but you get the idea; the broad Velcro strap is trapped behind the bolted in bracket, so won’t pull free itself. The bracket is bolted on to the rear bulkhead with large spreader washers, (known as repair washers) on the rear side of the panel. These are the same size repair washers as used to secure the seats to the floor, they will not pull through, in an impact. (Least, not in any form of survivable impact ) The strap itself, isn’t just Velcro, it had a metal buckle on it that the Velcro strap loops through before securing back on itself. This bit is important, as it makes the straps “hold” massively stronger

Clearly no legal requirement but considered "a sensible thing to do"

Can't tell conclusively from your pic but have you got a velcro safety strap around your extinguisher?