By itself extension works fine, but there is problem when it needs to work together with other extensions, for example, to read text produced by EBUB or FB2 extension.
For example:
1. epub file opened with EPUBReader extension (works fine), but opening resulting page with 'Read Aloud' extension results in the error message:
"missing host permission for the tab".
2. Once again, separately, both extensions work fine, error appear only when data are passed from the first to the second one.