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Javascript on Firefox 18


Over the last couple of weeks I have been getting asked to update to Fx 18.0.1 as I am currently using Fx17.0.1. I was going to do it but then something I read on another forum stopped me.

A poster on this forum I am a member of said that Firefox has disabled Javascript on his computer and that he can no longer watch videos and read most websites.

Now is that true that there is no more Javascript on Firefox?

If it is true then I am sticking with Fx17 for as long as I can as I need Javascript as I watch videos and need certain webpages to function right.

So what is the Javascript situation with Fx18?

Additional System Details

Installed Plug-ins

  • Shockwave Flash 11.5 r502
  • SiteAdvisor
  • Next Generation Java Plug-in 1.6.0_37 for Mozilla browsers
  • NPRuntime Script Plug-in Library for Java(TM) Deploy
  • McAfee MSC FF plugin DLL
  • Adobe PDF Plug-In For Firefox and Netscape 10.1.4
  • Adobe Shockwave for Director Netscape plug-in, version
  • DivX VOD Helper Plug-in
  • RealJukebox Netscape Plugin
  • RealNetworks(tm) RealPlayer Chrome Background Extension Plug-In
  • RealPlayer(tm) HTML5VideoShim Plug-In
  • RealPlayer(tm) LiveConnect-Enabled Plug-In
  • The QuickTime Plugin allows you to view a wide variety of multimedia content in Web pages. For more information, visit the QuickTime Web site.
  • McAfee Virtual Technician plugin for Mozilla (Gecko Version: 1.8b1)


  • User Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:17.0) Gecko/20100101 Firefox/17.0

More Information

  • Top 25 Contributor
617 solutions 4263 answers

Hello hoggys2much,

java is the problem, not javascript ( JavaScript is not Java )

the latest Java 7 update 11 is Vulnerable, so in firefox is blocked for your protection, see : Java Plugin 7 update 11 and lower (click-to-play), Windows has been blocked for your protection

see : How to use Java if it's been blocked

no permanently fix yet ! use 7.11 it if absolutely necessary.

if you like read all the discussion : SUMO community discussions - Another Java vulnerability...


Question owner

Thank you for that.

I have just checked my PC control panel and apparently I am running Java 6.0.370. Is that version any good? And does it run on Fx18?

If not what do you recommend?

  • Top 10 Contributor
  • Moderator
10752 solutions 96760 answers

It is best to install the latest Java 7 version because Firefox will complain with Java 6U38 that it is outdated.

Update the Java plugin to the latest version.

You can find the latest Java version on the Oracle website.

See Java Platform > Java SE 7U11 and Java 6U38 (Download JRE)

Question owner

Can anyone else help me please?

I do not listen to what cor-el has to say as he hasn't got a clue what he is talking about Just palms you off with unhelpful pathetic links that tell you nothing.

I wish he would stop coming near my posts. I have never understood how he got is status as he is completely useless.

I wish ideato had got back to me.

Tyler Downer
  • Administrator
  • Moderator
1165 solutions 6639 answers

Helpful Reply

What cor-el was trying to say is that no, the version of Java you have is out of date. You should uninstall it (and any other versions on your computer) and install the latest, Java 7 update 11.

However, with that in mind, please note that Java is not at all related to Javascript (there is an unfortunate naming coincidence here but they aren't at all related, this is why alot of people get confused about Java blocks). If you don't use Java it is best to leave it disabled as it is a horrible vector for viruses and attacks.

So, to sum it up, update to Java 7 update 11. Then install Firefox 18.0.1. This will ensure you are on the most secure and stable version of Java and Firefox.

  • Top 25 Contributor
617 solutions 4263 answers

Helpful Reply

Hello hoggys2much, indeed, as also said Tyler in his reply, cor-el reply is correct, see AliceWyman's note in the next link : https://support.mozilla.org/en-US/forums/contributors/708898?last=50261#post-50279

as you can see Java 6 was also vulnerable, so it's up to you to choose the version you want, the best is to use 7.11 if it is absolutely necessary, i do the same myself, i have it disable, and enable only when really need it.

thanks again

Question owner

This is to ideato and tylerdowner thank you for your help.

Just to let you know I have now updated to firefox 18.0.1 and Java 7.0.130 (Java SE7 update 13 and according to my plug-in list it looks like it is alright. There are no warning signs or stripes over it like 6 had.

One last question, Why is it that when ever I have to close down Firefox to apply an update or something and I go to restart it I get a warning message saying "please close down all open browsers before restarting firefox".

But the thing is I have no open browsers windows everything to do with Firefox is shut down. Most times I actually have to leave my desktop and go back in before I can re-open Firefox.

  • Top 25 Contributor
617 solutions 4263 answers

hoggys2much said :

One last question, Why is it that when ever I have to close down Firefox to apply an update or something and I go to restart it I get a warning message saying "please close down all open browsers before restarting firefox".

probably you mean "all browser windows before restarting firefox" not "all open browsers before restarting firefox"

if the update is Java and Flash player then you must close all browser windows when you run the installers. Do you get that message when you update firefox  ?