The site you are posting may have an API to allow the posts a little more elegantly?
There are many add-ons that address tab management, unknown if one will answer your question.
Google "firefox manage tabs"
Mozilla Technote about opening multiple URLs
If I read this correctly, such 'add-ons' are browser-specific. I can't anticipate which browsers my users might select, and can't set up profiles for whichever they choose anyway.
I guess I'm stuck with multiple tabs being opened for long urls?