Hi,
I tried to installed RefControl old add-on from xpi file with my FF51 old version but I go an error that said that this add-on could no be installed because it could not be verified.
How can I install it ? How to do it ? Thanks in advance.
How can I install an old add-on ?
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kerft
- Posts: 585
- Joined: January 30th, 2019, 9:38 am
Re: How can I install an old add-on ?
If none of your extensions are working, see here https://www.jeffersonscher.com/ffu/armagadd-on_2_0.html After that is done, drag the xpi into Firefox.
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ashanta
- Posts: 219
- Joined: August 26th, 2009, 5:39 am
Re: How can I install an old add-on ?
Thank you Kerf for this link !
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James
- Moderator
- Posts: 28005
- Joined: June 18th, 2003, 3:07 pm
- Location: Made in Canada
Re: How can I install an old add-on ?
Why use the random old Firefox 51.0 (Released back on January 24, 2017) and not say the 52 ESR as in 52.9.0esr released on June 26, 2018.
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Brummelchen
- Posts: 4480
- Joined: March 19th, 2005, 10:51 am
Re: How can I install an old add-on ?
only the four latest builds were (auto-)signed, others cant be installed because NO signing.
signing starts with v40 and was mandatory since v48. no luck for you.
alternative
https://addons.mozilla.org/de/firefox/a ... ercontrol/
but - again no luck for you, usable only since v52.
signing starts with v40 and was mandatory since v48. no luck for you.
alternative
https://addons.mozilla.org/de/firefox/a ... ercontrol/
but - again no luck for you, usable only since v52.