Hi, you can shrink the content area inside the window by holding down the Ctrl key and tapping the minus or hyphen key. However, if the whole Firefox window is too big for the screen, that's harder. Probably the quickest fix is to change from a resizable window to a maximized window. Press Alt+Spacebar to summon the window control menu, then click Maximize on that menu (or type the letter X). This won't fix bad information stored by Firefox about your window size, but hopefully can help for now. ---- Sometimes the settings file that stores window dimensions becomes corrupted with nonsensical values. You can rename the file and have Firefox rebuild it. Here's how: Open your current Firefox settings (AKA Firefox profile) folder using either * "3-bar" menu button > Help > More Troubleshooting Information * (menu bar) Help > More Troubleshooting Information * type or paste '''about:support''' in the address bar and press Enter In the first table on the page, on the Profile Folder row, click the "Open Folder" button. This should launch a new window listing various files and folders in Windows File Explorer. Leaving that window open, switch back to Firefox and Exit, either: * "3-bar" menu button > Exit * (menu bar) File > Exit Pause while Firefox finishes its cleanup, then: Right-click '''xulstore.json''' then Rename to something like '''xulstoreOLD.json''' Start Firefox back up. Do windows display normally again? ''That mini-reset may hide the bookmarks toolbar and/or menu bar.'' You can use one of these methods to show the toolbar list and select the desired bars there: * right-click (on Mac Ctrl+click) a blank spot on the tab bar (or the "+" button) * (menu bar) View > Toolbars<br><em>On Windows, tap the Alt key or F10 key to activate the menu bar temporarily.</em> * in Customize mode > Toolbars button (see: [[Customize Firefox controls, buttons and toolbars]]) To turn on the Bookmarks Toolbar or Menu Bar, click it on the list.