In order to test the new build against your existing cookies you will want to point the new build at the old profile. You may want to backup the old profile as well. 1. To find the profile location, using the old version of fx go to the three-line button settings > help > more troubleshooting information > check Profile Directory. Note the name of the profile and back up the entire folder just in case. 2. Install the build provided 3. In the new fx navigate to the profile dir and point it to your old profile (noted in step 1). It would also be a great help to get some logs if you are able to assist. For this particular problem they will need to be set from command line like so on windows x64: ``` set MOZ_LOG=timestamp,rotate:200,nsHttp:5,cookie:5 set MOZ_LOG_FILE=%TEMP%\log.txt "c:\Program Files\Mozilla Firefox\firefox.exe" ``` More details can be found [here](https://firefox-source-docs.mozilla.org/networking/http/logging.html), but the `cookie:5` is the important part here. If you are concerned about personal information in the logs then you can email to necko@mozilla.com. Thanks for the help!
Bug 1827988 Comment 5 Edit History
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In order to test the new build against your existing cookies you will want to point the new build at the old profile. You may want to backup the old profile as well. 1. To find the profile location, using the old version of fx go to the three-line button settings > help > more troubleshooting information > check Profile Directory. Note the name of the profile and back up the entire folder just in case. 2. Install the build provided 3. In the new fx navigate to the profile dir and point it to your old profile (noted in step 1). It would also be a great help to get some logs if you are able to assist. For this particular problem they will need to be set from command line like so on windows x64: ``` set MOZ_LOG=timestamp,rotate:200,nsHttp:5,cookie:5 set MOZ_LOG_FILE=%TEMP%\log.txt "c:\Program Files\Mozilla Firefox\firefox.exe" ``` More details can be found [here](https://firefox-source-docs.mozilla.org/networking/http/logging.html), but the `cookie:5` is the important part here. If you are concerned about personal information in the logs then you can email to necko@mozilla.com. Thanks for the help!