https://connect.mozilla.org/t5/discussions/how-to-merge-settings-between-different-firefox-instances/m-p/99163#M38567 <P>I have managed to transfer search settings by simply copying search.json.mozlz4 from one profile to another (with Firefox closed, of course).&nbsp; This is pretty safe, since the search engine parameters are platform-independent.&nbsp; I am still looking for a way to merge other customized settings from about:config.&nbsp; They are evidently all stored in prefs.js, which can be overridden by settings in user.js.&nbsp; What I need is a tool to compare different copies of prefs.js to simplify extracting the important settings to a platform-independent user.js file.</P> Sat, 21 Jun 2025 16:21:09 GMT rsbrux 2025-06-21T16:21:09Z https://connect.mozilla.org/t5/discussions/how-to-merge-settings-between-different-firefox-instances/m-p/82308#M31446 <P>I have several different instances of Firefox running on different platforms under different user accounts.&nbsp; I have shared my bookmarks among some of them by means of Firefox sync.&nbsp; However, I have a big mess with the settings.&nbsp; I am afraid to enable "settings" in Firefox sync, because some settings are platform-specific.&nbsp; For example my download settings for Firefox snap under Ubuntu will not work in Firefox under Windows and vice-versa.&nbsp; I would nonetheless like to profit from things I have configured in some instances (e.g. search engines and some settings in about:config) without having to "reinvent the wheel" on others. I need a way to selectively merge these settings.&nbsp; IIRC, these settings are stored in JSON files.&nbsp; Is there some way for me to selectively merge their contents without breaking Firefox?</P> Tue, 31 Dec 2024 10:49:19 GMT https://connect.mozilla.org/t5/discussions/how-to-merge-settings-between-different-firefox-instances/m-p/82308#M31446 rsbrux 2024-12-31T10:49:19Z https://connect.mozilla.org/t5/discussions/how-to-merge-settings-between-different-firefox-instances/m-p/99163#M38567 <P>I have managed to transfer search settings by simply copying search.json.mozlz4 from one profile to another (with Firefox closed, of course).&nbsp; This is pretty safe, since the search engine parameters are platform-independent.&nbsp; I am still looking for a way to merge other customized settings from about:config.&nbsp; They are evidently all stored in prefs.js, which can be overridden by settings in user.js.&nbsp; What I need is a tool to compare different copies of prefs.js to simplify extracting the important settings to a platform-independent user.js file.</P> Sat, 21 Jun 2025 16:21:09 GMT https://connect.mozilla.org/t5/discussions/how-to-merge-settings-between-different-firefox-instances/m-p/99163#M38567 rsbrux 2025-06-21T16:21:09Z