Since upgrading to Firefox 56.0.2 when I open more than one occurance of Firefox they both keep getting slower and slower until they crash.
I've been using firefox like this for years. One public window for work and a private one for personal. Since upgrading they get slower and slower until they crash. If I restart and only use one window, it works. But since this doesn't work for me I'll be using Chrome until you get this fixed.
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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 crash reports, and copy them. Now go to the reply box and paste them in.
For more help on crash reports, see; https://support.mozilla.org/en-US/kb/firefox-crashes-asking-support