Have plugin/addon injection issues

I had a simple plugin working which I created for my university dissertation , it suddenly stopped working roughly about one week ago and now even the default firefox starter plugin and demo example will not run or inject a file. I have tried running them on two seperate systems and tried both nightly, beta and regular firefox. Also tried running them on unbutu and windows machines with the same issue. It is an add on which is connected to a server which pulls and sends requests/data deppeneding on user queries. (which was again working correctly untill very resently) But now the script for requests is not being exacutedHas anything changed reclently on how plugins are handled? Any suggestions/help would be greatfully appriciated

Your question is too vague.
If you want help, post the source code for your extension.