Firebug says “No Javascript on this page”, even though JavaScript does exist on the page

Question

Why does Firebug say there is No Javascript on this page when there are clearly loads of JavaScript on the page. I even reloaded the page several time to make s

Answer 1

The same problem just happened to me. I thought that it was a problem in my scripts, but I checked google.com and the problem persisted. My problem was that I had updated my version of FF and kept the old version of FireBug. When I updated FireBug and everything was solved.

Answer 2

If the problem only shows up on a single page, check that your script folder is referenced from current folder (".") or that's reachable from the server root ("/").

<script src="./scripts/pagescripts.js" type="text/javascript"></script>

may not be the same as

<script src="/scripts/pagescripts.js" type="text/javascript"></script>

Answer 3

EDIT 2017 April

This answer is now outdated and I'm not even testing it anymore because I'm no longer using Firebug (a shame, I loved it years ago in a time it was The tool of trade for web developing).

EDIT 2014 November

The original answer is now more than a year outdated due to firebug evolution. Thanks to @AmadeusDrZaius to keep it on tracks

Answer for outdated firebug versions For anyone still with this problem after updating Firebug. Just click Clear Activation List option inside the Firebug menu.

For those who can't find it, note that "Clear Activation List" shows up in the dropdown from the Firebug icon in the toolbar, but not the Tools > Web Developer > Firebug menu.

I guess due to the bug previous hitting your working page it stays listed as "no activate FB for this site please".

Answer 4

FWIW this problem is still happening in August 2016. I'm using Firebug 2.0.17 with Firefox Dev Edition 50.0a2.

As a workaround, I'm able to use the Developer Tools, though they are not as robust as Firebug (when it's working).

Answer 5

One time this caught me out was when I published one of my sites and I was checking it out. No Javascript was working, there were no errors in the console and firebug showed no scripts.

It turned out that in that instance, I'd forgotten to allow the site in NoScript - so there really were no scripts being loaded.

Not sure if that's the problem you're facing but it's worth being aware of.

Answer 6

I upvoted @Tom_Thomson's answer above, but I am wondering if simply removing and then reinstalling the Firebug add-on might not have accomplished the same thing without losing all the other stuff like bookmarks.