There is a really great addon for Firefox called Web Developer by Chris Pederick, used by a lot of web developers. Yesterday mine disappeared (running Firefox 3.6) , I tried re-installing it but it still just showed a blank toolbar. A little searching around the web showed that there are conflicts between quite a few addons and Web Developer.
I remembered that Webmail Ad Blocker had recently updated to version 3.0. Disabling the addon brought my Web Developer toolbar straight back (after a Firefox restart of course). If your having problems getting the Web Developer toolbar to show begin by disabling your most recently updated addons until you find the culprit.
Please leave a comment below with which addon was causing the problem for you and the version you were using as this will help others.
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I resolve this problem thus:
Right-click on the toolbar and choose ‘Customize…’. then press the “default values” button (i don´t know the exact name of button in english janguage because my language is spanish, but is it not have problem locate this button), this activa the button in the web developer bar but only with icons (without texts) the i open the options in the web developer bar (last icon, or in the complement window) then there in the Genera lsection i change the icons to icnos and text.
Finally restart firefox and the problem its resolved.
Thank you Javier! I was just having the same problem and your solution quickly fixed it.
THANKS – IT WORKS!!!! TOP
@Javier: Thanks it works for me now.