How to clear or delete a browser session with firefox developer tools
- From the firefox button or the tools menu go to the Options > Privacy panel.
- Select "Firefox Will: Use Custom Settings for History"
- Click on the "Show Cookies" Button
- Use the search box to enter the domain name of your site under development or drill down the folder lists to locate the website whose cookies you want to delete.
- Select the cookie or cookies in the located list that you want to delete and click on "Remove Cookie".
Once this has been done you will just have to refresh your page and allow your PHP to check for a valid session, and when it does not find one it will create a new session and save a new PHPSESSID cookie to your browser as a brand new session that you can do what you like with.
There is a better way described here:
https://developer.mozilla.org/en-US/docs/Tools/Storage_Inspector
- Enable Storage tab in developer tools using the settings icon in top right corner of developer tools.
- Go to cookies and right click on it, then Delete All