InlineDisposition changes the disposition of Content-Disposition response headers from attachment to inline; this prevents servers from forcing the browser to save a file and allows that file to be viewed in the browser, if the browser supports it.
Here is a little more about the add-on from the developer:
Normally, when the browser receives content from a web server, the browser decides whether to view that content in-browser or handle it externally (either by saving it or opening it in an external application) based on whether the browser is capable of internally handling the content and on the user’s actions and preferences. However, through the use of the
Content-DispositionHTTP header, websites can override this behavior and force the browser to handle the content externally, even if the browser is capable of displaying the content and even if that is not what the user wanted. By altering the disposition type of
Content-Dispositionresponse headers from
inline, InlineDisposition restores user choice.
Want to learn more about this add-on? Check out InlineDisposition at the Firefox Add-ons website.