Hi embleton1, I think you might first confirm that Adblock Plus is still installed and enabled. To do that, call up the Add-ons page. Either: * Ctrl+Shift+a (Mac: Command+Shift+a) * "3-bar" menu button (or Tools menu) > Add-ons * type or paste '''about:addons''' in the address bar and press Enter/Return In the left column of the Add-ons page, click Extensions. Then scan down the right side; disabled extensions typically cluster at the bottom. Can you find ABP and make sure it is enabled? If it's completely missing you can re-install from the Add-ons site: https://addons.mozilla.org/firefox/addon/adblock-plus/ While you're on the Add-ons page, cast a critical eye over the list. Any extensions Firefox installs for built-in features are hidden from this page, so everything listed here is your choice (and your responsibility) to manage. Anything suspicious or that you just do not remember installing or why? If in doubt, disable (or remove). ---- If ABP is installed and enabled but its button is still not visible, try using Customize to check whether the button is on the "overflow" menu (drop-down at the right-end of the main toolbar) or otherwise available for moving to the visible part of the toolbar. See: [[Customize Firefox controls, buttons and toolbars]] Success?