You can run the bookmarklet anywhere and it will take you to the correct page.
You will get this message when you run the bookmarklet on the requests page.
Make sure you set it to 1 on your first use so you can allow popups. Otherwise you will lose all of you gifts that you set it to request! (Popup Settings for Chrome & Firefox)
Then click scan for apps I use and it will find all of the apps that you have requests for on the current page of requests.
It will give you a confirmation of how many are found.
Then click Grab all apps and it will replace the list with the apps found.
Next you need to set your options.
Make sure to skip all gifts that have limited accept quantities and things that give a bonus like the Crime Sprees! Then change number of gifts to grab to 100 (or whatever you want to accept at the time, it will stop on its own if it runs out of gifts before the number entered) and don't set the seconds between too low but it can be less than 8 (I use 4 seconds with 5 popups).
When you set the seconds below 7 (Which is his recommendation) you will get this confirmation that you need to hit CANCEL on to keep your settings. Hitting OK will revert the setting to 7 seconds.