Member Avatar for russey123

Has anyone else had a problem with Java running on Firefox using windows Vista. I have installed java and it works on internet exploreer but i wont work on firefox when i tryed to install i get a a installation has failed doenst tell me why or anything just want to know if anyone else has had this problem.

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  • Latest Post Latest Post by eranga262154

Dani AI

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A short diagnostic summary and practical checklist that builds on 's report and the early suggestions from and .

Common causes when Java appears to install but Firefox does not show the plugin: a mismatch between the browser build and the installed JRE (32-bit vs 64-bit), installer permission failures on Vista, leftover older Java/plugin files, or the wrong installer type (online vs offline). These are quick to check and fix.

Checklist (apply in order):

  • Verify which Firefox build is running (32-bit or 64-bit) and install the matching JRE. Use the Java manual/offline installers rather than the web installer to avoid partial installs: Java manual downloads.
  • Run the JRE installer as Administrator. On Vista, right-click the installer and choose "Run as administrator" to avoid permission-related failures.
  • Uninstall all Java versions from Control Panel first, reboot, then install the desired JRE cleanly. Leftover files can prevent Firefox from detecting the plugin.
  • Check Firefox directly: open Add-ons -> Plugins (or type about:plugins) to see whether the Java plugin is listed and enabled. If it does not appear, confirm the JRE was installed into the same Program Files tree (x86 vs Program Files) that matches the Firefox bitness.
  • Enable the Java Console from the Java Control Panel to capture errors; check its output during page load to see plugin initialization messages.
  • If the installer still reports a failure, collect the Java install log and the Firefox about:plugins output for deeper troubleshooting.

Note: For readers years later, modern Firefox releases removed support for the legacy NPAPI Java browser plugin; in that case the plugin will not work regardless of install steps—use a browser that still supports NPAPI, Firefox ESR that predates the break, or Java Web Start as alternatives.

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Member Avatar for Member #46692

I am unsure if this question belongs in this forum. Maybe you should also ask it in the troubleshooting forums.

Member Avatar for eranga262154

Which versions of FireFox you used. Check that you have enable java on FF.

Member Avatar for russey123

I have the newest firefox from the website and it is enable also i tryed firefox with another computer with vista and i got the same error. But i asked and kid is one of my classes about it and he has firefox with java and had no problems but he is also running a 64-bit system

Member Avatar for eranga262154

he is also running a 64-bit system

I don't think that this is an issue, not depend on version. If you can test your code on that kids' machine.

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