Firefox 115.36 er on a iMac 10.13.6 is no longer fully compatible with Schwab
Just started getting messages when I log into Schwab that my browser, Firefox 115.36 esr, is not fully compatible and that I may see some performance issues. Yes I do see issues such as misshapen popup windows when buying/selling shares.
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Yes, you're probably aware that you're running a legacy version that's still compatible with your older Mac:
To get a newer current release, you'd need to upgrade your macOS first.
The 115 ESR is still getting critical security updates so it's a great choice for your system, but that doesn't mean it's not deemed "too old" for some websites and their platform features.
If you're not blocked from accessing the sites then you can just ignore the messaging. If the sites start blocking access, you could try some masking tricks from previous threads: https://support.mozilla.org/questions/1582867