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Thumbnails on some websites will not show up

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I have Firefox 22 & WinXP Pro. Some websites will not show a thumbnail picture on my home page. I have read all the articles on thumbnails & none of them help. I have cleared the cache, loaded the page by left clicking the blank thumbnail & letting it load. They are NOT https sites & I do not use private browsing. The sites WILL show pictures on my homepage in Google Chrome, so it's not the website. I will try to attach a screenshot, but I do not see a browse button. Can anyone help? Thanks, Phil

I have Firefox 22 & WinXP Pro. Some websites will not show a thumbnail picture on my home page. I have read all the articles on thumbnails & none of them help. I have cleared the cache, loaded the page by left clicking the blank thumbnail & letting it load. They are NOT https sites & I do not use private browsing. The sites WILL show pictures on my homepage in Google Chrome, so it's not the website. I will try to attach a screenshot, but I do not see a browse button. Can anyone help? Thanks, Phil

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I've attached a screenshot of part of my home page & my extensions. It's the top left, Bridgeclues that won't create a thumbnail (which I used to have).

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Pages that send a no-store or no-cache header (Tools > Page Info > General) aren't cached and thus Firefox does not generate a thumbnail (Bug #754608).

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Thank you for your reply. However, I've read all the previous articles & none of them helped.

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Hi Cor-el: Thanks for responding. I went to Tools/Page Info, but couldn't find a "general" category. The website http://www.bridgeclues.com/ does show up in Chrome & used to show up in Firefox. How can I tell if there's a no-store or no-cache header? -- Phil