A computer-implemented method, comprising: concurrently displaying: a reading list panel as a sidebar window with respect to a main window of a content viewing application, wherein the reading list panel includes one or more article representations with respective identifying information and respective abstracts; a first article in a normal mode in the main window, including content of the first article and an advertisement, icon, link, button, search field or image; in response to a first input activating a graphical element of the content viewing application, listing in the reading list panel a first article representation of the first article; while displaying, in a reader mode in the main window, a respective article previously selected from the reading list panel, receiving a selection of a second article representation from the reading list panel; and in response to the selection of the second article representation from the reading list panel: in accordance with a determination that the reader mode is not disabled in the content viewing application: displaying a second article, corresponding to the second article representation, in the reader mode within the main window, wherein displaying the second article in the reader mode includes displaying content of the second article and excludes displaying an advertisement, icon, link, button, search field or image, that would be displayed in the normal mode for the second article. concurrently displaying: a reading list panel as a sidebar window with respect to a main window of a content viewing application, wherein the reading list panel includes one or more article representations with respective identifying information and respective abstracts; a first article in a normal mode in the main window, including content of the first article and an advertisement, icon, link, button, search field or image; a reading list panel as a sidebar window with respect to a main window of a content viewing application, wherein the reading list panel includes one or more article representations with respective identifying information and respective abstracts; a first article in a normal mode in the main window, including content of the first article and an advertisement, icon, link, button, search field or image; in response to a first input activating a graphical element of the content viewing application, listing in the reading list panel a first article representation of the first article; while displaying, in a reader mode in the main window, a respective article previously selected from the reading list panel, receiving a selection of a second article representation from the reading list panel; and in response to the selection of the second article representation from the reading list panel: in accordance with a determination that the reader mode is not disabled in the content viewing application: displaying a second article, corresponding to the second article representation, in the reader mode within the main window, wherein displaying the second article in the reader mode includes displaying content of the second article and excludes displaying an advertisement, icon, link, button, search field or image, that would be displayed in the normal mode for the second article.