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Firefox add-ons, and running multiple versions of Firefox
Sunday, April 10th, 2011 03:56 pmI've updated my ToggleDocumentColors add-on for Firefox 4.0, but the new version won't be available on that page until it has been reviewed.
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If you want to install Firefox 4 without uninstalling Firefox 3.6, you can follow the instructions on this page. That will let you try out Firefox 4 to see if you like it, before getting rid of the older version. It also is useful if you need to test your add-ons in both versions.
Even with both versions of Firefox installed and with different profiles created for each, you can normally only run one version or the other at a time, not both at once. When you have one version of Firefox open, and you try to open the other version, you instead get another instance of the first version. However, using the "-no-remote" option with one of the versions allows both versions to be run at the same time. But make note of the info on this page. When using the "-no-remote" option, it is possible to open multiple windows of that version by right-clicking links and selecting "Open Link in New Window". But if you try to open a 2nd window from the shortcut with the "-no-remote" option, you get the error message listed on that page.
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If you are developing a Firefox add-on and get a "UUID doesn't match add-on" error when trying to upload a new version of the add-on, it may be due to your having changed the <em:id> value in the install.rdf file. To correct the error, change em:id back to the value used in the previous versions.
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If you want to install Firefox 4 without uninstalling Firefox 3.6, you can follow the instructions on this page. That will let you try out Firefox 4 to see if you like it, before getting rid of the older version. It also is useful if you need to test your add-ons in both versions.
Even with both versions of Firefox installed and with different profiles created for each, you can normally only run one version or the other at a time, not both at once. When you have one version of Firefox open, and you try to open the other version, you instead get another instance of the first version. However, using the "-no-remote" option with one of the versions allows both versions to be run at the same time. But make note of the info on this page. When using the "-no-remote" option, it is possible to open multiple windows of that version by right-clicking links and selecting "Open Link in New Window". But if you try to open a 2nd window from the shortcut with the "-no-remote" option, you get the error message listed on that page.
..
If you are developing a Firefox add-on and get a "UUID doesn't match add-on" error when trying to upload a new version of the add-on, it may be due to your having changed the <em:id> value in the install.rdf file. To correct the error, change em:id back to the value used in the previous versions.