Recent answers to Installing the current extended release of Firefox while keeper earlier versionhttps://support.mozilla.org/ga-IE/questions/13176482020-12-11T10:22:06-08:00You can also rename profiles.ini to make Firefox 83 create a new xxxxxxxx.default-release profile an2020-12-11T10:22:06-08:00cor-elhttps://support.mozilla.org/ga-IE/questions/1317648#answer-1375240<p>You can also rename profiles.ini to make Firefox 83 create a new xxxxxxxx.default-release profile and lock that profile for Firefox 83.
Then you can start Firefox 52 with the Profile Manager (add a space and -P to the target line) and re-register your previous Firefox 52 profile by using the "Choose Folder" button.
See:
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<ul><li><a href="https://support.mozilla.org/en-US/kb/how-run-firefox-when-profile-missing-inaccessible" rel="nofollow">https://support.mozilla.org/en-US/kb/how-run-firefox-when-profile-missing-inaccessible</a>
</li></ul>
<p>Best is probably to use a desktop shortcut that specifies the profile folder (-P "&lt;profile&gt;"), at least for Firefox 52.
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<ul><li><a href="https://developer.mozilla.org/en-US/Command_Line_Options" rel="nofollow">https://developer.mozilla.org/en-US/Command_Line_Options</a>
</li></ul>Hi Dandelion, you can install a different version of Firefox into a separate directory, but there is2020-12-11T07:22:25-08:00jscher2000https://support.mozilla.org/ga-IE/questions/1317648#answer-1375198<p>Hi Dandelion, you can install a different version of Firefox into a separate directory, but there is some danger that it will upconvert your Firefox 52 profile when you start it up, making it permanently incompatible with Firefox 52. It's a little bit complicated keeping them from stepping on one another. Here are my general thoughts, but you might seek out other comments as well.
</p><p>(1) Make a backup! <a href="/en-US/kb/back-and-restore-information-firefox-profiles" rel="nofollow">Back up and restore information in Firefox profiles</a>
</p><p>(2) Create a new profile (let's call it Fx78 for the moment) and make it the default -- this should get upconverted without disturbing your old profile, or it will be ignored and end up being extra (steps below).
</p><p>(3) Do a custom install of Firefox 78 into its own program folder and let it take over the new profile or create its own.
</p><p>(4) Update your Firefox 52 shortcut to specify the applicable profile, or to point to the Profile Manager dialog.
</p><p><em><strong>Step #2</strong></em>
</p><p>Inside Firefox, type or paste <strong>about:profiles</strong> in the address bar and press Enter/Return to load it.
</p><p>Click the "Create a New Profile" button, then click Next. Assign a name like Fx78, ignore the option to relocate the profile folder, and click the Finish button.
</p><p>Scroll down to that profile and if you see a <strong>Set as Default Profile</strong> button, click that to make it the default.
</p><p><em><strong>Step #3</strong></em>
</p><p>See: <a href="/en-US/kb/custom-installation-firefox-on-windows" rel="nofollow">Custom installation of Firefox on Windows</a>. Short story: you need the "full" installer which lets you specify the folder.
</p><p><em><strong>Step #4</strong></em>
</p><p>You can set the old Firefox shortcut to use a specific profile or call up the external Profile Manager by modifying the "Target" field.
</p><p>Right-click a desktop shortcut and choose Properties. If you pinned the shortcut to the Task bar, right-click the icon, then right-click Mozilla Firefox to get to Properties.
</p><p>Windows should show the Shortcut tab automatically, or click it.
</p><p>The Target line usually will have something like:
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<ul><li> "C:\Program Files (x86)\Mozilla Firefox\firefox.exe"
</li><li> "C:\Program Files\Mozilla Firefox\firefox.exe"
</li></ul>
<p>Add a space and <strong>-P</strong> to have the shortcut call up the Profile Manager so you can select the old profile from the list. So
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<ul><li> "C:\Program Files (x86)\Mozilla Firefox\firefox.exe" -P
</li><li> "C:\Program Files\Mozilla Firefox\firefox.exe" -P
</li></ul>
<p>If you know the name of the profile -- for example, if it's <em>default</em> -- then you can add that to the shortcut as well. For example:
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<ul><li> "C:\Program Files (x86)\Mozilla Firefox\firefox.exe" -P "default"
</li><li> "C:\Program Files\Mozilla Firefox\firefox.exe" -P "default"
</li></ul>
<p>Disclaimer: I can't give guarantees that this will all work, so don't forget step #1 -- make a backup.
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<p>Regarding Flash, your bank must be planning to update its site. Adobe has announced there is a kill switch in the Flash plugin that will make it inoperable on January 12, 2021.
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