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I have installed the latest versions of YSlow and Firebug into the latest version of Firefox on Windows 7 (and restarted Firefox), but when I click on YSlow nothing happens. Also, when I click on Firebug, it opens but has no YSlow tab. I have disabled all other Firefox plugins and played with right-clicking YSlow and clicking run once and auto-run.

What am I doing wrong?

Wayne Koorts
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byronyasgur
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    Would there be any version conflicts between firebug and yslow? – Kasun Gajasinghe Sep 22 '11 at 03:51
  • I've been having this same exact problem. When I remove/disable YSlow and then install/activate it, it works... but only until I close Firefox again. – Chris Tonkinson Sep 23 '11 at 01:11
  • The author has asked for help with Firebug/Firefox as it no longer works https://twitter.com/yslow/status/596009262490464256/photo/1 – Matthew Lock Dec 10 '15 at 01:00
  • problem with me is that I don't see the YSlow pluging icon at all from where I can activate it for usage. I'm on firefox 47.x – RBT Jul 02 '16 at 22:57
  • YSlow seems to have got broken inside firebug extension in latest firefox release as evident from this tweet https://twitter.com/yslow/status/596009262490464256 – RBT Jul 03 '16 at 02:13

3 Answers3

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As a temporary solution, try using the YSlow bookmarklet.

It's an equivalent of regular YSlow.

Dario Seidl
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Kasun Gajasinghe
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  • most unique thing about ySlow while searching it in google chrome extension list is that it is not at all searchable in chrome web store :-). I wonder why is that. But you can get it using this link : https://chrome.google.com/webstore/detail/yslow/ninejjcohidippngpapiilnmkgllmakh – RBT Jul 03 '16 at 02:16
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YSlow seems to have got broken inside firebug extension in latest firefox release as evident from this tweet from their official twitter handle. Try using GTMetrix google chrome extension. It provides one of the most exhaustive web performance statistics using PageSpeed and ySlow both. Below I've mentioned google chrome store extension link. The only thing is that you will have to use chrome instead of firefox as your web browser.

https://chrome.google.com/webstore/detail/gtmetrix-plugin/maaoaegejdlcdijmlfmpmeknliggkfdm

RBT
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0

Try running Firefox in Safe Mode and disable other plugins that may conflict with YSlow. Also ensure you have really restarted Firefox.

bundy
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  • did you mean start firefox in safe mode - it disables the plugins that way - didnt work – byronyasgur Sep 22 '11 at 01:32
  • Please clarify this answer with some more detail, otherwise someone will probably downvote you. Because you're new, I won't :-) Take into account what has been said in the comment by the poster. – Wayne Koorts Sep 22 '11 at 01:36
  • Thanks Wayne I updated the answer. Because the answer it is no longer useful I would delete it if I could. :( – bundy Sep 22 '11 at 01:41
  • Gave you an upvote for effort. There should be a delete link next to "edit" under the answer text, I didn't think any special amount of rep was needed to delete your own answers, but I may be wrong about that. – Wayne Koorts Sep 22 '11 at 02:10