Using Firefox I have some site addresses deemed unsafe (incl Scumv but I guess that's understandable Bouch et al

) because there's no padlock shown on address line.
I don't have the same problem on Mcsoft edge although I do have a common problem on trying to reference canalplus.fr on both browsers (no padlock deemed unsafe)
The canalplus site is a major site in france for all Canal + items including accounts and is renowned and huge clientele and popularity..
No warnings anywhere on internet.
Most suggest no https:// etc when added the pre addr removed and same prob ....
Canal+ site has black padlock with red line across which is flagged.
I've read various comments on the subject and can't believe that e.g Canalplus site is dodgy ... their whole product is TV and media related.
Any ideas?