last month (on march 7) firefox had an update and it gave me problems on another site. it was a completely separate problem from yours, but the thing that got fucked up was the browsing in private mode option. basically i had to stop using private mode because they jacked with the cookie options and one of my addons wouldn't work on that site unless i turned off private browsing so i could set the cookies the way they needed to be. damn you, firefox. it wasn't an issue before that.
i'm not sure how this helps you, but since that day i had to change some stuff in the options because shit was going awry. i'm not sure what browser technical thingy is responsible for the page links not showing up but if someone could tell you what that is you might be able to adjust the setting.
have you tried changing your rollitup options to show a different amount of posts per page? i doubt it will fix it but you can make fewer pages to go through if you set it to 40 per page. does the icon to "go to last post" show up?
make sure to set it to accept 3rd party cookies and to allow rollitup.org cookies. this might not fix it but the same update messed mine up so it's worth taking care of. it's under the privacy icon under "options" (the firefox button in the top left). that's all i'm qualified to suggest. good luck.