Fed up of searching small information in big packet capture file?

I usually face this problem where I need to find for some information in a very huge file. And, it takes lot of time to filter and show the results.
Now, I got different kind of problem, but, similar. Customer sent set of capture files, around 80, each of 25MB (looks like, he knows that opening a big file and debugging using it is very frustrating). Just thought of using some command lines and there are some already.
We can use tcpdump over a network packet capture file like tcpdump -r filename and we can apply filters using -R. Filter is similar to that of wireshark, but not same.
Something like 'tcpdump -r output.cap$i host 10.240.111.29 and host 10.240.115.55 and port 80 and port 16876 >> filteredData'.
Even Wireshark have command line tool. Hadn't explored yet.

Facing problems with firefox

Last few months, I was facing different kind of issues with firefox. History navigation (back, forward) buttons won't appear. History of urls accessed won't get saved. Cannot bookmark pages, search box on the left side doesn't work. Reason looks to be corrupted database files in the mozilla profile directory. In Linux, it will be $HOME/.mozilla/firefox//.
Close all browser instances, remove the files like places.sqlite (for navigation, bookmarks not working), formhistory.sqlite, search.json, search.sqlite (if search bar is not working). Hopefully, things works fine. If still not, create new profile and start using that.