Hello there! In order for us to further assist you in these tab crashes, we require some crash reports. If you don't know how to collect this data, please follow these steps:

1. Enter about:crashes in the Firefox address bar and press Enter. Then two lists of crash reports should appear. One of them, at the top, will the the unsubmitted crash reports, if you have any. If you don't have any unsubmitted crash reports, just look for the latest submitted crash reports.
2. Paste the most crash reports of the most relevant date to these tab crashes and post a reply with them.

Gah-Your-tab-just-crashed https://support.mozilla.org/en-US/kb/troubleshoot-firefox-crashes-closing-or-quitting