欧博百家乐Open source extension
This is exactly as safe as the regular .ROBLOSECURITY cookie, with the caveat that if someone gets access to your cookies, they have all of your accounts, not just the current one.
edit: I would like to clarify that this is more or less a safe design
I don’t like how the other .ROBLOSECURITY cookies are stored as cookies.
Cookies are always sent to the server when you make a request. As such, the Roblox servers see very clearly that you are using this extension and it also tacks on more data sent per request.
I would suggest storing the cookies in some other form of extension local storage. (No, nothing of the kind that can be accessed by content scripts)
It would be ideal as a Greasemonkey script because these are more universal, but I’m not sure if these can access HTTP-only cookies.
edit: If you have such a better storage method, then you also gain space to store all localstorage and sessionstorage in it.
Note that Greasemonkey has such storage. Inspect it to learn how to get storage.
final edit: Firefox has “containers” built-in (there used to be extensions to do that before then), which let you store and switch between sessions. However, I feel that it has severe UX issues, such as a depressing inability to operate on the list of containers, poor keyboard support and Internet Explorer syndrome (complete disregard of people who want to use multiple tabs).
I would not use this extension myself, but it should easily be better and smoother to use than Containers in Firefox when someone verifies that it works on it.
(Chrome and Firefox use the same extensions today fyi)