I log in to my work network from home, and it requires an F5 plugin. Firefox keeps blocking this download. How can I install the plugin?

Not to get technical on you, but do you know whether it is a plugin or an extension? Firefox 43 now enforces the requirement that ''extensions'' be submitted to Mozilla for signing, and many publishers have not yet gotten around to that. Check for the add-on on the Add-ons page. Either: * Ctrl+Shift+a * "3-bar" menu button (or Tools menu) > Add-ons In the left column, click Extensions. Then scroll the list on the right side to the bottom to see whether the missing add-on is listed there with any other disabled extensions. If there's no Enable button and it says that it cannot be enabled because it is not verified, you can make a temporary exception to the signing requirement. This is global for all extensions, there's currently no way to only make an exception for specific extensions, so if any extensions look suspicious, keep them disabled (or remove them). (1) In a new tab, type or paste '''about:config''' in the address bar and press Enter/Return. Click the button promising to be careful. (2) In the search box above the list, type or paste '''xpin''' and pause while the list is filtered (3) Double-click the '''xpinstall.signatures.required''' preference to switch it from true to false -- note that this is for '''Firefox 43 only''' Does that help?