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Is there a way to install a deprecated addon in Firefox?

I remember doing it in Firefox 3 - can't remember how I did it exactly :(

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You have to add the extensions.check* booleans to about:config in order for them to work.

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In the above, moving from 3.X to 4.0 beta to 4.0 and then to an optimized version I compiled myself based on 4.2a I've gathered the above settings, I bet you need to add extensions.checkCompatibility.4.0.

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That did it! Thanks a lot - now I can install gleebox thegleebox.com, can't live without that thing :) – timkl Apr 9 '11 at 8:40
Thank you, looks awesome! – Tom Wijsman Apr 9 '11 at 11:18
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I'm not sure if it'll work with FF4, but apparently with older versions it was a matter of going to about:config, finding extensions.checkCompatibility and setting its value to false.

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extensions.checkCompatibility doesn't exist in FF4. Thx for the idea, though :) – timkl Apr 8 '11 at 11:49
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@timmkl - It was never there by default. You need to create it and set its value: about:config | [RClick] New | Boolean – JRobert Apr 8 '11 at 11:56
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up vote 1 down vote

I hope you are asking about incompatible add ons. If that's so. Install compatibility reporter firefox add on and install your Firefox add on. Now it will be installed!!!

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