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I am trying to save a page with Firefox. It's a post on facebook, loaded on its own page. I clicked "view previous comments" so all comments are displayed. I save the page.

I then loaded the saved file. "View previous comments" is back, and if I click on it it wants to load the source off of the internet. I tried loading the page again, displaying all the comments again, switching Firefox to offline mode, and saving the page. I got three consecutive "source could not be read" errors. It saved part of it anyway. I loaded the page, and again, "view previous comments" is back. I tried "view page source" from the completely loaded page, and then saved the file from that window, and I get exactly the same results.

Firefox 20.0.1; Windows XP SP3.

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The comments are probably being loaded on demand using AJAX when you click the load link. It's not going to be that easy to save them. Related: Get Current HTML Of Page Built With AJAX Requests. – Karan May 28 '13 at 18:41
If all you need is a screen shot, have you seen How can you take a screenshot of an entire webpage? yet? – Ƭᴇcʜιᴇ007 May 28 '13 at 18:47

I've just tried to do the same using the "Print Edit" add-on in FF and it seems to provide what you want.

In FB expand the comments and click on the print Edit option "Print Edit" - you can then remove the sections you don't want and save the remaining as a Firefox HTML doc. Alternatively edit the page and print it out. Note that you can't save from the Print Preview screen.

I run Windows 7 but it's a Firefox function so should work for you

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