To disable javascript for specific site in uBlock Origin, click the extension icon, then click the "more" button in the menu several times until all options are displayed (you only have to do this step once total, not per site).
Once the 5 top menu icons are visible, click the one to the right that looks like </> to disable javascript for the site you're on.
Once the 5 top menu icons are visible, click the one to the right that looks like </> to disable javascript for the site you're on.