Transmitting order instructions to broker

Here is a message I have sent my broker -- I have complained previously about Commsec not accepting instructions from browsers. Firefox is the worst, but Chrome and Edge are also affected. Stopping and re-running the browser helps. Only trading instructions are affected. Up to now, that is : Firefox has now started occasionally failing with less sensitive instructions. In fact Firefox is now so bad that I must use only Chrome. I don't know where the fault lies -- broker, browser, me or all of us. Thanks if you would convey this issue to your software team. Possibly the problem lies with overly tight security somewhere in the communication. What do you think?