This page is outdated. Accessibility support is not complete and therefore disabled.
SumatraPDF prerelease supports experimental UIA accessibility API, which allows for example screen readers to read out loud the selected text in document.
Accessibility features are considered experimental and accessibility is not enabled at the moment in the SumatraPDF plugin.
Known issue: Sometimes Narrator does not read the selection. This seems to be a focus related problem and selecting another window and then back the SumatraPDF window may fix the problem.
PDF, XPS, DjVu