Not all addon developers make their updates ahead of time and release updates for release versions only.

I got this from Roboform

 We can confirm that customization of RoboForm toolbar position in FireFox 29/30 can cause RoboForm toolbar

unavailable in the browser, so you may need to either downgrade to FireFox 28 for a while or leave RoboForm toolbar on a separate line where it was installed initially to make it work in your current version of FireFox. The problem is under study now. Please bear with us. Thanks in advance and sorry for your inconvenience.

See the Install an older version of Firefox article, please note that security flaws fixed in v29 and v30 will be unfixed.

Many applications that provide a toolbar for Firefox only supports the current Release(currently 29.0.1) at most and not development channel builds like Beta, Aurora and Nightly.

It may have been fluke if it worked in a earlier Beta test build of Firefox 30.0

is page where you can download old firefox versions. Right now I am trying firefox 29 for roboform2Go. the toolbar shows, but I'm not getting automatic login when I click on a login in firefox. I have to drag the PW and Username by hand. Guess I will try firefox 28

edit: removed unofficial download site link as all can be found from Mozilla ftp if you must use a insecure version.

O.K. - Yes it does work automatic ally with Roboform2Go and Firefox 29 . Don't know why, but had to try it again and then it worked