I never ran into problems except with this latest version: 3.0.3

The problem: Websites with self-signed certificate are no longer working. It doesn’t give me the option to add exceptions like it used to be. (websites with exceptions added in previous versions are not effected.)

Tried this:
Go to Tools -> Option menu, select Advanced, on Encription tab click on View Certificates.
Go to Servers tab in Certificate Manager, click on Add Exception
Enter the host (https://localhost) then click on Get Certificate button.
Same problem

After some searching, some are saying to re-set one of Firefox settings in about:config. However it doesn’t work in my case.

I gave it another try in the Certification Manager by use the host name with port number. It worked!

I am glad it worked out and I don’t need to go back to 3.0.2 or wait for fix in the next version.

It’s fast and html/css standards well supported. The greatest feature of firefox is it’s extension infrastructures.

you can find almost everything you needed for your surfing pleasure or web programming.

Here’s a list of them which are always installed with my firefox. You can download them and find more info from by clicking on the links

• Download Statusbar :: Firefox Add-ons
  - Download Statusbar 0.9.5.1. A download manager that put all your downloads’ progress and info on firefox’s status bar.
• Answers :: Firefox Add-ons
  - Answers.com’s firefox add-on
• SearchStatus
  - A great SEO tool that can show current website’s google page rank, alexa ranking and also provide links for your website indexing results and etc.
• Web Developer :: Firefox Add-ons
  - A tool integrates most useful tasks for web developers, such as xhtml/css validation, showing css block table info and etc.
• Autofill Forms :: Firefox Add-ons
  - Fillin your web forms