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Can Normal Firefox and Fireofx nightly be installed on the same system without interfering with eachother?

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I currently have standard Firefox Quantum installed on my Windows 10 computer, I would like to install Firefox nightly to help find and report bugs as well as get new features faster. Can I install separate versions of Firefox without one overwriting another interfering with the other?

I currently have standard Firefox Quantum installed on my Windows 10 computer, I would like to install Firefox nightly to help find and report bugs as well as get new features faster. Can I install separate versions of Firefox without one overwriting another interfering with the other?

Chosen solution

You need to be careful, but it can be done.

Each Firefox must be placed in its own Programs Folder. Also, each must have its own profile.

You can use sync to share the profile data, BUT different versions may not be able to share certain settings, add-ons . . . . So sync only passwords and bookmarks.

Download the full installers for each version you want to use. When you run the installer, select the Manual option and place each in its own programs folder (see pictures).

Note: When the installer is done, Do Not run the browser yet.

Note: Whatever version is loaded Last will be the default. Also, create the profiles before you start installing other Firefox's. +++++++++++++++++++++++++++++++++++++++++++++++ With Windows, each Firefox must have its own batch file program to send the nessassary information into the browser when started.

Here is an example (on one line only); C:\Program Files (x86)\Mozilla Firefox Current\firefox.exe -no-remote -P Firefox_v_57

https://developer.mozilla.org/en-US/docs/Mozilla/Command_Line_Options

Usage: C:\PROGRA~1\MOZILL~1\firefox.exe [ options ... ] [URL]
      where options include:
 
 -h or -help        Print this message.
 -v or -version     Print Firefox version.
 -P <profile>       Start with <profile>.
 -migration         Start with migration wizard.
 -ProfileManager    Start with ProfileManager.
 -no-remote         Do not accept or send remote commands; implies -new-instance.
 -new-instance      Open new instance, not a new window in running instance. (Does not work on Windows) 
 -UILocale <locale> Start with <locale> resources as UI Locale.
 -safe-mode         Disables extensions and themes for this session.
 -console           Start Firefox with a debugging console.
 -jsconsole         Open the Error console.
 -browser           Open a browser window.
 -new-window  <url> Open <url> in a new window.
 -new-tab     <url> Open <url> in a new tab.
 -preferences       Open Options dialog.
 -search     <term> Search <term> with your default search engine.
 -setDefaultBrowser Set this app as the default browser.
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Additional System Details

Application

  • User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:66.0) Gecko/20100101 Firefox/66.0

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FredMcD
  • Top 10 Contributor
4188 solutions 58449 answers

Chosen Solution

You need to be careful, but it can be done.

Each Firefox must be placed in its own Programs Folder. Also, each must have its own profile.

You can use sync to share the profile data, BUT different versions may not be able to share certain settings, add-ons . . . . So sync only passwords and bookmarks.

Download the full installers for each version you want to use. When you run the installer, select the Manual option and place each in its own programs folder (see pictures).

Note: When the installer is done, Do Not run the browser yet.

Note: Whatever version is loaded Last will be the default. Also, create the profiles before you start installing other Firefox's. +++++++++++++++++++++++++++++++++++++++++++++++ With Windows, each Firefox must have its own batch file program to send the nessassary information into the browser when started.

Here is an example (on one line only); C:\Program Files (x86)\Mozilla Firefox Current\firefox.exe -no-remote -P Firefox_v_57

https://developer.mozilla.org/en-US/docs/Mozilla/Command_Line_Options

Usage: C:\PROGRA~1\MOZILL~1\firefox.exe [ options ... ] [URL]
      where options include:
 
 -h or -help        Print this message.
 -v or -version     Print Firefox version.
 -P <profile>       Start with <profile>.
 -migration         Start with migration wizard.
 -ProfileManager    Start with ProfileManager.
 -no-remote         Do not accept or send remote commands; implies -new-instance.
 -new-instance      Open new instance, not a new window in running instance. (Does not work on Windows) 
 -UILocale <locale> Start with <locale> resources as UI Locale.
 -safe-mode         Disables extensions and themes for this session.
 -console           Start Firefox with a debugging console.
 -jsconsole         Open the Error console.
 -browser           Open a browser window.
 -new-window  <url> Open <url> in a new window.
 -new-tab     <url> Open <url> in a new tab.
 -preferences       Open Options dialog.
 -search     <term> Search <term> with your default search engine.
 -setDefaultBrowser Set this app as the default browser.
You need to be careful, but it can be done. Each Firefox must be placed in its own Programs Folder. Also, each must have its own profile. You can use sync to share the profile data, BUT different versions may not be able to share certain settings, add-ons . . . . So sync only passwords and bookmarks. Download the full installers for each version you want to use. When you run the installer, select the Manual option and place each in its own programs folder (see pictures). Note: When the installer is done, Do Not run the browser yet. '''Note: '''Whatever version is loaded Last will be the default. Also, create the profiles before you start installing other Firefox's. +++++++++++++++++++++++++++++++++++++++++++++++ With Windows, each Firefox must have its own batch file program to send the nessassary information into the browser when started. Here is an example (on one line only); C:\Program Files (x86)\Mozilla Firefox Current\firefox.exe -no-remote -P Firefox_v_57 https://developer.mozilla.org/en-US/docs/Mozilla/Command_Line_Options Usage: C:\PROGRA~1\MOZILL~1\firefox.exe [ options ... ] [URL] where options include: -h or -help Print this message. -v or -version Print Firefox version. -P <profile> Start with <profile>. -migration Start with migration wizard. -ProfileManager Start with ProfileManager. -no-remote Do not accept or send remote commands; implies -new-instance. -new-instance Open new instance, not a new window in running instance. (Does not work on Windows) -UILocale <locale> Start with <locale> resources as UI Locale. -safe-mode Disables extensions and themes for this session. -console Start Firefox with a debugging console. -jsconsole Open the Error console. -browser Open a browser window. -new-window <url> Open <url> in a new window. -new-tab <url> Open <url> in a new tab. -preferences Open Options dialog. -search <term> Search <term> with your default search engine. -setDefaultBrowser Set this app as the default browser.

Modified by James

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FredMcD
  • Top 10 Contributor
4188 solutions 58449 answers

(see pictures)

(see pictures)
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GerardoPcp04
  • Top 25 Contributor
373 solutions 2438 answers

.....

.....

Modified by GerardoPcp04

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cor-el
  • Top 10 Contributor
  • Moderator
17336 solutions 156738 answers

Current Nightly builds (still 68, but will soon go to 69) should use its own profile when you aren't specifying or creating a profile with the Profile Manager and thus shouldn't interfere with a release. On Windows they will probably also install in their own Firefox program folder.

Current Nightly builds (still 68, but will soon go to 69) should use its own profile when you aren't specifying or creating a profile with the Profile Manager and thus shouldn't interfere with a release. On Windows they will probably also install in their own Firefox program folder.
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cor-el
  • Top 10 Contributor
  • Moderator
17336 solutions 156738 answers

See also;

(please do not comment in bug reports
https://bugzilla.mozilla.org/page.cgi?id=etiquette.html
)

See also; *[https://bugzilla.mozilla.org/show_bug.cgi?id=1474285 Bug 1474285] - Implement profile-per-install [67] (<i>please do not comment in bug reports<br>https://bugzilla.mozilla.org/page.cgi?id=etiquette.html</i>)
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