We put out a Firefox party banners at the park's gate and another banner inside the park where we are sitting. (Thanks Vineel for the banners.) In the meantime, more guys from MSVR Engg. College and HITAM joined us. Then, the swag was distributed, as we are sitting.
We started with everyone introducing themselves. Then went on with what are their favorite features of Firefox, and how they use Firefox, etc.
Cbrao said that he is unable to open multiple Gmail accounts at the same time in Firefox, where as he can do so in IE8, using the 'Start a new session' feature. I told him that he can use multiple profiles. (But, afterwards by Googling, I found Gmail Manager.)
I talked about the awsomebar and recent improvements like restricting the matches to bookmarks (*) and to tagged (+), etc. Manish enquired about a way to install/uninstall add-ons without restaring Firefox. I told him that I didn't know there is no way and however pointed the Jetpacks can meet that requirement.
Sireesh proposed to start a community website for Firefox users in Andhra Pradesh. Manish suggested it would be better we conduct meetups about all free software.
A gathering about Firefox without talk Add-ons? Never. People talked about their favorite add-ons. Some of those here:

• Aardvark: you can use it to clean up (remove ads, or other things on the that you do not need on) a web page before printing
• Tree Style Tab: organizes tabs in a tree structure. If you open multiple tabs by clicking on links on a page, all those tabs become children of the tab that you opened them from
• S3 Firefox Organizer: Helps you manage your files on Amazon S3
• FlashGot: use your external download manager in place of Firefox's
• Zotero: helps you manage your research sources
• Weave: a service from Mozilla. Sync your bookmarks, browsing history, and saved passwords.
• Indic Input Extension: type in Indian languages
• Window Resizer: resize your browser window to standard resolution sizes
• Firebug: debugging tool for HTML, CSS and JavaScirpt
• FoxyProxy: Use multiple internet connections? Make your life easy.
• FoxClocks: Have current time of multiple locations on your status bar or toolbar.
• DownThemAll: a download manager cum accelerator for your Firefox
• Cooliris: browse photos and videos on the web or on your computer
• Padma: read Indian language local newspapers in Unicode

Overall, 22 people attended the party.
This is what I can recall; there are definetely other interesting bits. I hope other guys would post more details.

I posted the invite in Telugu in my blog
 
—Veeven