Swichtheme cannot maintain different themes in different tabs

Hi,

I have a feature request that I think could make this module much more useful and robust.

If I am looking at a list of themes (say a theme gallery) and I middle click two themes. I will open up two new browser tabs in Firefox each showing the example site in a different theme. Lets say tab 1 is the green theme and tab 2 is the red theme. Now, since I opened tab 1 before tab 2, if I click on a link in tab 1, it changes from green to red which is not very nice. Now both my tabs are red.

I've noticed this exact issue on many theme galleries online. I'm guessing most of them probably use switchtheme. Its pretty confusing for the user as it breaks the illusion of opening a separate example site.

It would be nice if there could be some sort of cross-browser support for tab isolation of themes.

Perhaps it could work by rendering all the hyperlinks on tab 1 with ?theme=green and all hyperlinks on tab 2 with ?theme=red. So that whenever you clicked on a link in tab 1, you would keep the same theme.