add-on not installed becasue palemoon does not support webextentions???

[FourthDr]

Hi:

I was wondering if anyone else was having this strange issues installing xpi extensions that work fine on Firefox ESR 52.9.0. When I try to install the following extensions I received an error stating: "This add-on could not be installed because Palemoon does not support webextensions.". The thing is non of the extension I was trying to install are webextensions! See list below:

BehindTheOverlay{0.1.6}.xpi
WebmailAdBlocker{5.2.1}.xpi

There are probably others, but these two are the ones I was needing as I test out Palemoon. Let me know if there is something simple I can do to fix this problem. I know you can edit contents of the .xpi installer for some extension to get them working. I did a quick search of the forum but didn't find anything specific to these two extensions.

Thanks.

[Falna]

Let me know if there is something simple I can do to fix this problem.

Find some compatible alternatives?

Dismiss The Overlay (from GitHub) should be good for the first.
I'm not familiar with the second, but UBlock or ηMatrix may be all you need (found here).

I know you can edit contents of the .xpi installer for some extension to get them working.

It's not a guaranteed fix, but you could try

[ron_1]

The thing is non of the extension I was trying to install are webextensions! See list below:

BehindTheOverlay{0.1.6}.xpi
WebmailAdBlocker{5.2.1}.xpi

And are you sure they aren't webextensions? FF came out with that crappy technology in 2017, and version 5.2 of webmail ad blocker came out in 2019. Webextensions will never work in Pale Moon. Have you looked at Pale Moon's add-on site?

https://addons.palemoon.org/extensions/

[gepus]

They must be WebExtentions since both are listed and available at AMO.

[Moonchild]

Just because it has an "xpi" file extension doesn't mean it's not a WebExtension

[moonbat]

If you're looking for extensions, start with the Pale Moon addons site first rather than digging for long dead and abandoned Firefox ones. Several of the most popular ones have already been forked and ported for Pale Moon, or have equivalents.

[FourthDr]

Well, I'm pretty sure that the versions of the FF extensions I was trying to install are not webextensions. Since I am currently running them in Firefox 52.9.0 ESR which definitely doesn't support webextensions.

I did look through all the Palemoon extensions but didn't see anything that does what BehindTheOverlay{0.1.6}.xpi or WebmailAdBlocker{5.2.1}.xpi do. If any of these are listed on AMO they are much newer versions that actually are webextensions.

If I had to guess why Palemoon is thinking these are webextensions, I'd say it was because there isn't an install.rdf inside of the .xpi like most all of the other extension I currently have installed. Most probably the author of these extensions was in a transitional state. Therefore, Palemoon thinks they are webextensions. There may also be commented out code that doesn't run in FF 52.9.0 that is only a place holder for the next version which eventually became a webextension but not yet implemented. Or it could just be a bug in Palemoon's handling of some add-ons with newer code, but are not actually webextensions. I figured someone here would know the answer.

[FourthDr]

Let me know if there is something simple I can do to fix this problem.

Find some compatible alternatives?

Dismiss The Overlay (from GitHub) should be good for the first.
I'm not familiar with the second, but UBlock or ηMatrix may be all you need (found here).

I know you can edit contents of the .xpi installer for some extension to get them working.

It's not a guaranteed fix, but you could try

I already have uBlock Origin installed because AdBlockPlus generates the same Palemoon doesn't support webextensions error. And that was with a slightly earlier version AdblockPlus-freeadblocker{3.6.3}.xpi. My currently installed version on FF is 3.12.

I had not heard of that other overlay blocker. I might give it a try. Thanks.

[moonbat]

If I recall, at the 52.x timeframe FF was gradually implementing WE APIs and so extensions made during that time may have used whatever was partially implemented at the time. At any rate, you're better off first looking at the Pale Moon addons site since many of the popular FF ones have been forked or have similar replacements.

Off-topic:
This is also probably how Waterfox Classic was able to claim support for both XUL and web extensions; the latter implementation was incomplete and many contemporary FF extensions wouldn't work properly even if they could be installed.

[Moonchild]

Since I am currently running them in Firefox 52.9.0 ESR which definitely doesn't support webextensions.

WebExtension support (in its initial API iteration) was considered stable in Firefox 48, and most certainly available and enabled in Firefox 52 ESR.

[gepus]

If any of these are listed on AMO they are much newer versions that actually are webextensions.ions.

Here you go:

BehindTheOverlay
https://addons.mozilla.org/en-US/firefo ... /versions/
Version 0.1.6
Released Feb 11, 2018

WebmailAdBlocker
https://addons.mozilla.org/en-US/firefo ... /versions/
Version 5.2.1
Released Jul 9, 2019

Keep in mind that Mozilla removed all legacy extensions from their site!
All extensions they provide (even older versions) are WebExtensions.

You could check Classic Add-ons Archive from JustOff: https://github.com/JustOff/ca-
or https://ia803100.us.archive.org/view_ar ... or.org.tar
and see if you find what you are looking for.
Also keep in mind that these are unmaintained extensions and there is no guarantee that they will work as expected or at all.