Hi Elizabeth, all your data on sites you visited, bookmarked sites, etc., are kept on your computer. Data you share between your Firefox installations cannot be read on a website, just in your Firefox browser. By history do you mean sites you visited recently that you want to re-open? Some questions: Do you want them to open automatically when you start Firefox? You can either set up multiple home pages, or you can use pinned tabs. Here are some articles on those options: [[How to set the home page]], [[Pinned Tabs - keep favorite websites open and just a click away]]. Or would it be better to have a folder of links that you can open when you want that group of pages? You can bookmark them all to a folder, then right-click the folder and choose Open All in Tabs. Here's a starting point for info on that: [[Bookmarks in Firefox]]. Or if you were asking about customizing the Top Sites section of the new tab page, try this one: [[Customize the New Tab page]]. Any of that helpful so far?