Often Firefox forgets that I read a topic, and that makes it difficult to see which topics I've visited during a session.
I have to mark a forum as read, even though I read it.
Very frustrating!
Searching for '+firefox +phpbb +session +topic +read' is like searching for trouble.
How do I fix it?
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Do you use the new post icon to get to the post, or do you use the latest post icon?
Using the new post icon works reliably (at least in this regard) using the latest post icon doesn't.
This is all cookie based. phpBB2 does not store anything on the server about what you've read and what you haven't, it just uses a timestamped cookie and a date/time comparison to figure it out.
The first thing I always do is to open the 'posts since last visit', flip through all the pages and then work backwards through the cached pages.
phpBB3 supports proper server-side 'read' flags but I still haven't gotten around to that. The theming thread died before reacing a finished version and I haven't had time to investigate it, especially since the conversion process took multiple hours last time I tested it.