Try downloading alternate and easiest way * getfirefox.com

What version are you trying to install? Note: '''''Swarnava's''''' link takes you to the current Firefox download page (Firefox 8 as of the date of this reply). '''''Firefox version 4 and above are not compatible with OSX versions lower than 10.5''''' Beginning with Firefox 4, Macs must have an Intel x86 processor (which you have) '''''and''''' OSX 10.5 or higher (your version is OSX 10.4). *System Requirements: [https://www.mozilla.org/en-US/firefox/4.0/system-requirements/index.html Firefox 4] [https://www.mozilla.org/en-US/firefox/5.0/system-requirements/index.html Firefox 5] [https://www.mozilla.org/en-US/firefox/6.0/system-requirements/index.html Firefox 6] [https://www.mozilla.org/en-US/firefox/7.0/system-requirements/index.html Firefox 7] [https://www.mozilla.org/en-US/firefox/8.0/system-requirements/index.html Firefox 8] The good news is that Firefox 3.6.24 still supports OSX 10.4 and Macs with the PPC Mac architecture. The bad news is that support for the Firefox 3.6.x series is likely to end in the first quarter of 2012. *System requirements: [https://www.mozilla.org/en-US/firefox/3.6/system-requirements/index.html Firefox 3.6.x] *Download Firefox 3.6.24: https://www.mozilla.org/en-US/firefox/all-older.html *Also see --> http://support.mozilla.com/en-US/kb/Installing+Firefox+on+Mac You can try the third-party product '''''TenFourFox''''' that supports PPC Macs. Firefox 8 version of '''''TenFourFox''''' is available. The product is based on Firefox released versions. All support is provided by the developer, not by this site: *Home page: http://www.floodgap.com/software/tenfourfox/ *Developer's blog: http://tenfourfox.blogspot.com/ *VERY IMPORTANT; read this carefully: https://code.google.com/p/tenfourfox/wiki/PluginsNoLongerSupported '''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.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]