It looks like you're using a mobile browser.
Browser extensions are not well-supported on mobile browsers, so Social Fixer won't run there, sorry. But just in case we've identified your browser incorrectly, download options may appear below.
Download Social Fixer for Firefox
It looks like you're using Firefox.
The new Social Fixer is pending approval by Mozilla in the Add-On directory.
It will be available from their official source soon.
Until then (or instead), you can use the Greasemonkey version if you would like.
It looks like you're using Safari.
Until an official Safari extension can be built (I do not have a Mac), the best way to use it in Safari is to use the Tampermonkey extension and the User Script below.
First install the Tampermonkey Extension. Then click below to install the User Script into your browser.
It looks like you're using Internet Explorer or Edge.
Unfortunately, the extension system for Microsoft Edge is not yet available to developers. Only a few select extensions are available now. When extensions are opened up for all developers to create, Social Fixer will be one of them!
Until then, you can install the recently-release TamperMonkey Extension in Edge, and then use the User Script below.