https://support.mozilla.com/en-US/kb/Firefox+crashes#Getting_the_most_accurate_help_with_your_Firefox_crash

Type about:crashes in the URL bar and hit Enter. Click the hyperlinks to bring up the Crash Report pages and copy'n'paste the URL of each of those reports into the message box here. We'll see if we can help you figure out what is causing those crashes to happen.

Same thing happens to me

http://crash-stats.mozilla.com/report/index/bp-225c7ab1-0fc3-4333-9d6d-2a6282100607

http://crash-stats.mozilla.com/report/index/bp-1ec0d414-7954-48a1-b383-eeb5c2100607

http://crash-stats.mozilla.com/report/index/bp-20494d18-560e-4cdc-9a54-cf14a2100607

http://crash-stats.mozilla.com/report/index/9842670c-1d90-42bd-8b8d-2b8372100607

http://crash-stats.mozilla.com/report/index/b2c8c2b7-8eb2-493d-a55d-fc4c82100607

http://crash-stats.mozilla.com/report/index/bp-5c5d3e77-7d55-4d6b-a75d-81a372100607

http://crash-stats.mozilla.com/report/index/bp-bd5b53b3-adc8-44f2-aa74-d37b02100601

http://crash-stats.mozilla.com/report/index/bp-d2a03d43-b1c0-4cbd-ad79-db5a92100601

http://crash-stats.mozilla.com/report/index/bp-60450d44-fbc9-4519-83f8-7ae6e2100601

http://crash-stats.mozilla.com/report/index/bp-152fe69a-cc44-4dd2-8de9-e24db2100601

http://crash-stats.mozilla.com/report/index/4bd14bc1-bfd9-475d-9b0e-e29c02100609

http://crash-stats.mozilla.com/report/index/bp-61d82069-664c-4cd3-8322-975762100530

http://crash-stats.mozilla.com/report/index/bp-acdd7a98-0814-40ed-a391-9139c2100523

http://crash-stats.mozilla.com/report/index/d55940b3-91e8-4800-ad12-b4e3d2100523

 These are a few of the crashes. I got tired of waiting the system to find them, but I suppose this will give you an idea of what's going on. 
 On one forum, I found that the cause was the Highliter add on. I deleted it but I haven't found anything on Ebay to bid on to see if it cured my problem.

I have experienced the same exact problem for several days.

http://crash-stats.mozilla.com/report/index/bp-c0dfd638-7529-4a4e-a4b9-a37cc2100605 http://crash-stats.mozilla.com/report/index/bp-64cfea19-a494-435e-87e1-d7e862100609 http://crash-stats.mozilla.com/report/index/bp-807494ad-a3f4-4b67-aa19-766752100609 http://crash-stats.mozilla.com/report/index/bp-28d9c3fb-4c40-4e99-bf94-98a7c2100608

These are the last four crashes. All while confirming ebay bids.

Wayne, try deleting the Highliter add on and bid on Ebay and see if the problem is solved. I have nothing to bid on right now. If it does work after you delete it, let me know.

I deleted the highlighter add on and successfully confirmed a bid on ebay. It looks like Tom has the answer.

Thanks

 Thanks for the reply. Now I know I'm good to go for my next Ebay bid. On the forum that I got this information about the Highliter being faulty, the author said that he thought that the Highliter was the same as the Highjacker virus. What ever that is. :-)

I have no idea what anyone is talking about when they say to delete the highliter. I can never get passed the confirm bid stage because it crashes. I leave my email address in the popup box for firefox but I never hear back about anything.

same problem, plan to remove highlighter as I have never had an issue before i installed the hightlighter, i don't recall at least, but lost two items where i really had no time to reload Firefox and bid again. Both times it was end of auction bids with someone counter offering, my bids were confirmed. Kinda takes the fun out of it. May try to bid in explorer, which would be sad as I loath it. dan

 Go to your "Add and Remove Programs" in your control panel and delete "Highlighter"   You shouldn't have any more problems on ebay.

I deleted highlighter in an earlier version, then installed 3.6.10 but I'm still having the problem. any one have any idea?