don't know how to tell what version of firefox i have, whether it is the latest version, and how to get the latest version if i don't already have it.
To find your version: https://support.mozilla.com/en-US/kb/Finding+your+
See if there is an update available by clicking Help > Check for Updates
You can always see what the latest version is here:
For update options, Tools > Options > Advanced, Update tab; see: http://support.mozilla.com/en-US/kb/Options+window
Other Issues: ~~red:You have installed plug-ins with known security issues. You should update them immediately.~~
Update Java: your ver. ~~red:1.4.2 (very old)~~; current ver. 126.96.36.199 (important security update 04-15-2010)
(Firefox 3.6 and above requires Java 188.8.131.52 or higher; see: http://support.mozilla.com/en-US/kb/Java-related+i
Install/Update Adobe Flash Player for Firefox (aka Shockwave Flash): your ver. 10.~~red:0 r45~~; current ver. 10.1 r53 (important security update 2010-06-10; see: http://www.adobe.com/support/security/bulletins/ap
Install/Update Adobe Reader for Firefox (aka Adobe PDF Plug-In For Firefox): your ver. 9.3.2; current ver. 9.3.3 (important security update release 06-29-2010; see: http://www.adobe.com/support/security/bulletins/ap
Just click on Firefox and then click help. a menu will pop up It should say something like help-Get Started-Troubleshooting Information -Submit feedback -Restart with add ons disabled and last the one you need About Firefox click that one it will tell you what version you are running.
Since Firefox 6, Help>About just says Firefox is up to date, if it is. Instead you need to go to Help>About>TroubleShooting information.