'''''Linkification''''' was not developed by Mozilla. *The third party developer appears to have abandoned the Add-on (no longer updates it). *The last update available on the Mozilla Firefox Add-ons site ( https://addons.mozilla.org/en-US/firefox/addon/linkification/ ) was made compatible only through Firefox 3.6.x *The developer posted version 1.3.9 on his/her own site which was made compatible through Firefox 4 *'''''Read the comments section on the Add-ons page for suggestions.''''' **I would NOT download from another site as you do not know what you might be getting. **You can install the following and force compatibility in Add-ons > Extensions ***https://addons.mozilla.org/en-US/firefox/addon/add-on-compatibility-reporter/?src=ss **Under "Reviews", click "See all ###user reviews". The suggestion ''by marwn098 on November 11, 2011'' is the only one that I would recommend. ***Link to that suggestion --> https://addons.mozilla.org/en-US/firefox/addon/linkification/reviews/321220/ '''If this reply solves your problem, please click "Solved It" next to this reply when <u>signed-in</u> to the forum.''' ------------------------- Not related to your question, but... You may need to update some plug-ins. Check your plug-ins and update as necessary: *Plug-in check --> http://www.mozilla.org/en-US/plugincheck/ *'''''Adobe Shockwave for Director Netscape plug-in''''': [https://support.mozilla.org/en-US/kb/Using%20the%20Shockwave%20plugin%20with%20Firefox#w_installing-shockwave Installing ('''''or Updating''''') the Shockwave plugin with Firefox] *Adobe PDF Plug-In For Firefox and Netscape: [https://support.mozilla.org/en-US/kb/Using%20the%20Adobe%20Reader%20plugin%20with%20Firefox#w_installing-and-updating-adobe-reader Installing/Updating Adobe Reader in Firefox] *Shockwave Flash (Adobe Flash or Flash): [https://support.mozilla.org/en-US/kb/Managing%20the%20Flash%20plugin#w_updating-flash Updating Flash in Firefox] *'''''Next Generation Java Plug-in for Mozilla browsers''''': [https://support.mozilla.org/en-US/kb/Using%20the%20Java%20plugin%20with%20Firefox#w_installing-or-updating-java Installing or Updating Java in Firefox]