By editing the script and changing the page url being looked for I made it work again.
On version 0.6.6.2 I changed line 66 from
GME_page_listing = /\/seek\/cache_details\.aspx/.test(GME_page),[/Code] to [Code]GME_page_listing = /\/geocache\/GC/.test(GME_page),[/Code] As this is the first time I have fiddled with a regular expression it may not be 100% optimal but it works for me (on Chrome and Opera). Just don't ask me where to find the relevant .js file on your system as it varies on OS and browser. Excellent! Thank you; it works find on Firefox too.