Ever since upgrade to macOS Tahoe 26.5.2 and Firefox about version 150 SOME forms have stopped working
eg https://transportnsw.info/opal-view/#/account/cards is meant to show down arrow next to name - does not appear; go to Profile, Edit address - 'Save as delivery address' checkbox and Submit button do not work. Also had this on the StGeorge bank page https://www.ui.stgeorge.com.au/resolve/etb0/createCustComplaint - Next button does not work. other sites as well have buttons not working (about 20% of sites?) (Sorry both the above examples need accounts to test). Often (not always) if I open the page with Chrome it works. I think they were working ok after macOS update but after a Firefox update went to a very light screen - problem started then.
Also - using about:support the copy raw data button works; the copy text button does not.
Thanks
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Do you reproduce while using a Private Window with no site data used, or restarting into Troubleshoot Mode to eliminate any addon interference?
Thanks Tried Troubleshoot mode with limited success https://bookings.nowbookit.com/?accountid=9febf121-7617-4708-b39d-f59d419cb3c6&venueid=6957&theme=light&colors=hex,000000,ffecb3 started working (Next button failed before troubleshoot mode) but https://transportnsw.info/opal-view/#/account/cards showing same errors.
Could you remove any "Cookies and site data…" from the shield icon when on that site, and then try again from a Private Window? If it still reproduces, and is behind a login, the only option is to "Report Broken Site" from the browser menu — to help submit some logging details with that form.
What you can try just for comparison, is to download the separate Firefox Nightly from nightly.mozilla.org — that comes with its own separate profile so you can check the same sites with a clean slate — to see if another version behaves differently.