how to store data , and add button in firefox / chrome javascript plugin

im beginner to java script / XUL development and c++ if needed .

i have 2 basic questions and i need some directions .

background : i like to build simple plugin that schedule by date actions to preform. 1. can i store data ( dates + ids ) so the plug in could read and write to it , what is the limitations ? 2. what is the best way to add button to gmail , or you tube , is Grease monkey is the only way ?

Thanks for helping .

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To perform automatic date operations, you need your own Date()function & these links wil help you: https://developer.mozilla.org/en/CSS/Getting_Started/XUL_user_interfaces https://wiki.mozilla.org/XUL:Specs:DateTimePickers

Regarding read & write to any files in XUL javaScript is pretty simple:

https://developer.mozilla.org/en/Code_snippets/File_I%2F%2FO http://puna.net.nz/archives/Code/Mozilla%20XUL%20LOG%20-%20read%20local%20files%20and%20write%20local%20files.htm

The above links explained very clearly to read & write any type of files in any bit format in a directory or in a local machine, there is no limitation.

I have no idea baout Grease Monkey but in XUL use ca use DOM function to create buttons & elements dynamically.

https://developer.mozilla.org/en/XUL/button

http://www.borngeek.com/firefox/toolbar-tutorial/chapter-6/