Sudden problem with Google filters in Firefox

[flyingbeetle]

Hello all,

Recently, I have problems with the Proxomitron filters for Google in Firefox 15 under Windows 7 32 Bit. I am using the Light Blue Theme and Toggle Left Bar filters, which worked absolutely fine in the past. This changed last week or so, probably after a Firefox update. When I now submit a search, the first result page is ok as usual. But when I click on "Next", the following page lacks the Light Blue Theme and the toggle triangle is gone. The left bar does not show up. I use the same filters in IE9 and everything still works fine there.
Strangely enough, it still works without problems on my other computer in Firefox 15 under Windows XP. I find this quite confusing, but I am still thinking that the latest Firefox version is the suspect.

I am not so well-versed in programming, but I hope that one of you experts can help me.

Attached are screen shots of the first ok result page (1.png), the second messed-up page after clicking Next (2.png) and my Google filters in Proxomitron (3.png).

Best regards
Thomas