Hi xutianshu, can you give a link to a page online that demonstrates this problem? ---- Also, your Firefox identified itself to the forum as version 47. As you may know, the current versions of Firefox are: * Regular release: 64.0.2 ([https://www.mozilla.org/firefox/all/ Installers]) * Extended Support Release (ESR): 60.4.0esr ([https://www.mozilla.org/firefox/organizations/all/ Installers]) ''(Note for 64-bit Windows users: [[How to switch from 32-bit to 64-bit Firefox]])'' If something is holding you back from upgrading Firefox, please let us know so we can suggest solutions or workarounds. Version 47 is not secure.