Type about:preferences#advanced<enter> in the address bar. Select Data Choices. Turn on Enable Crash Reporter.

In the address bar, type about:crashes<enter>. Note: If any reports do not have BP in front of the numbers/letters, click it to submit them.

The crash report is several pages of data. We need the report numbers to see the whole report.

Using your mouse, mark the most resent 7 - 10 crash reports, and copy them. Now go to the reply box below and paste them in.

Some of your crash reports weren’t sent to the Mozilla Servers.

See attachment - screen shoot. There is no data to submit after 2016-06-04 8:04 AM. Crash Reported doesn't appear any longer after this date as well. Even I had 4 crashes today already. Reports are not being recorded & there is much more missing from May. I can try force quit Mozilla & see if this will start crash reporter...? I can submit those from April if this may help.

bp-60528540-2503-43be-a5b5-3b05a2160604

Signature: mozInlineSpellWordUtil::SplitDOMWord

Product Firefox Version 46.0.1 Build ID 20160502172042 Release Channel release OS OS X 10.9 OS Version 10.9.5 13F1808

This is for Sumo's Related Bugs 1139141 NEW --- Mac crash in mozInlineSpellWordUtil::SplitDOMWord

So you stopped getting crash reports when you upgraded to v47? Did you Enable the Crash Reporter? Please make sure.

Crash Reporter is enable & Share additional data (i.e., Telemetry) I switched on as well. I stopped getting crash reports before my upgrade to v47 This laptop has no emails than chance of viruses is very small

E-mail is only one way for a virus to get in. One of the most common is thru installers. Then there are the ones that piggyback your connection. And there are contaminated websites, and other ways.

Mac Malware Scanners https://discussions.apple.com/message/29938930#29938930

You can also try https://www.malwarebytes.org/antimalware/mac/index.html

I looked at the bug report. So far this is only on Mac's. Something to do with the spellchecker. Are you using a spell/grammar checker add-on? As a test, disable all spellcheckers.

Thanks so much for all help. Scanning for any suspicion activities was already done just to be sure. I will try again later tonight & will do new clean mozilla installation - maybe something went wrong with 46.0.1 & upgrades after that. Also I'm running Little Snitch which can get very intense & some traffic to websites gets blocked however this doesn't affect Safari as much. I don't have any spell/grammar checker add-on Is new BBEdit could have any impact?

I don't know Little Snitch. As a test, you can disable it.