Go to Special:Forum and click the upper right button to read the forum policies. With fluid layout, the policies open in an extremely narrow and left-aligned box that doesn't look very fluid. (I'm using Firefox.)
Go to Special:Forum and click the upper right button to read the forum policies. With fluid layout, the policies open in an extremely narrow and left-aligned box that doesn't look very fluid. (I'm using Firefox.)
Please write in to Special:Contact and give us some more details. Specifically, what version of Firefox you are using, and what operating system version you have. If you can update Firefox, please do so and let us know if the problem is still happening. Also, we'd be interested to know if you see the same issue in another browser.
We had one other report of this same issue (the user was also using Firefox) but could not reproduce it. Forum (and Message Wall) are the first features to get an updated design for the modals (pop-up windows) and we certainly want to fix any bugs before rolling it out to more parts of the site.
Feel free to post updates here as well, for others to see, but we'd like to talk about details via a support request.