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 recent 7 - 10 Submitted crash reports, and copy them. Now go to the reply box and paste them in.

Please, Do not post a screenshot ! !

For more help on crash reports, see; https://support.mozilla.org/en-US/kb/firefox-crashes-asking-support

i've earlyoom installed and firefox killed by it. and about:crashes is empty. idk how to do a crash report.

Are you currently using a version from the repositories of your Linux distribution? Try the Firefox version from the official Mozilla server:

https://www.mozilla.org/en-US/firefox/all/