There are a couple of options. You can either click the big power button style icon in umatrix on any website that allows all js on that website. This will also

There are a couple of options. You can either click the big power button style icon in umatrix on any website that allows all js on that website. This will also allow all trackers, etc, but is handy in a pinch when doing something like making a purchase on a new website where you don't want to have something go wrong mid-way because some js was blocked from a critical domain. You also have more fine-grained control where the matrix interface allows you to white-list specific domains (and you can select whether you want JS/Frame/cookies, etc per domain). If you save your white-listing, that will always be remembered even across other websites. So for example, if I were to white-list twitter.com for js/frame and save that, then if I visit another site that embeds links to twitter widgets, those will work because you've already white-listed twitter. Umatrix does take a bit of effort initially when you start with a blank slate, but over time, it works fairly well and I feel a lot more comfortable browsing the web with it.