You have a PPC Mac and the newest versions of Firefox are not compatible with that architecture. Newer versions of Firefox require an Intel x86 processor. See -->https://www.mozilla.org/en-US/firefox/7.0/system-requirements/index.html Firefox 3.6.23, the current updated version of Firefox 3.6.x that you are using, '''''is compatible''''' with the PPC Mac. '''''Note that support for the Firefox 3.6.x series is likely to end in the first quarter of 2012.''''' *Download Firefox 3.6.23: https://www.mozilla.org/en-US/firefox/all-older.html *Installing on a Mac: http://support.mozilla.com/en-US/kb/Installing+Firefox+on+Mac There is a third-party product based on the '''''current''''' Firefox release that is compatible with the PPC Mac architecture, named '''''TenFourFox'''''. '''''Note that support for '''''TenFourFox''''' is not provided on this forum and is the responsibility of the developer of that product.''''' *Home page for TenFourFox: http://www.floodgap.com/software/tenfourfox/ *Developer's blog: http://tenfourfox.blogspot.com/ '''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: https://www-trunk.stage.mozilla.com/en-US/plugincheck/ *Adobe Shockwave for Director Netscape plug-in: [https://support.mozilla.com/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.com/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.com/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.com/en-US/kb/Using%20the%20Java%20plugin%20with%20Firefox#w_installing-or-updating-java Installing or Updating Java in Firefox]