Diễn đàn hỗ trợ Firefox

I have several machines on my local network. I work on machine A, and run applications remotely using ssh -X on the other machines. Today I discovered that when I start Firefox on newly-upgraded machine B, it's actually starting the older version that's on machine A. This seems obviously wrong, and is certainly not what I want to happen. I want to run the newer Firefox that's on B, and have it display on A.

Longer details: A runs OpenSUSE Leap 15.0. B runs Leap 15.4. I start an xterm on B with the command " "ssh -X -l me B", and programs other than Firefox I run from that xterm display on A's monitors, as expected. However, when I try to run Firefox (by typing "firefox &" on the command line, what actually runs is the older version of Firefox that is on A, just as if I'd started it with the same command on one of A's terminals.

Is this a known behavior, and if so, is there a way to work around it? Or am I just doing something really stupid?

I installed an older ESR version on a used laptop I got a few weeks ago. Everything's working fine, except the following issue with Bookmarks:

On my Bookmarks Library page I keep two columns, Name and Added (because on some folders I have many bookmarks and I track them by the date added). When I move any bookmarks to another folder, the "added" date becomes the date and time I moved them(!). Also, when I change the bookmark "name", it also changes the "added" to the date I changed it(!). Basically Added is acting like Last Modified.

Any ideas what's going on? I've never had this issue before.