On sites with a lot of tokens opening a page with the token replacement list will slow down the browser or even crash it.
The token module lately introduced the possibility to show tokens in a dialog which loads the tokens on demand using ajax:
The change is backward compatible.
Btw. loading the tokens in the dialog is still slow and still could crash the browser but at least it would be on demand :D
I'm not sure if this plays well with accessibility concerns!
User interface changes
The tree list of tokens is replaced by a link to open a dialog with the token tree list.