# How to download an add-on?

**URL:** <https://discourse.mozilla.org/t/how-to-download-an-add-on/37275>\
**Category:** Add-on Support\
**Created:** [March 22, 2019, 7:26am UTC](https://discourse.mozilla.org/t/how-to-download-an-add-on/37275 "2019-03-22T07:26:06Z")\
**Posts on this page:** 9\
**Page:** 1

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**Author:** ![marabu.too](https://avatars.discourse-cdn.com/v4/letter/m/b487fb/32.png) [@marabu.too](https://discourse.mozilla.org/u/marabu.too)\
**Post date:** [March 22, 2019, 7:26am UTC](https://discourse.mozilla.org/t/how-to-download-an-add-on/37275/1 "2019-03-22T07:26:06Z")

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Hi,  
I haven’t installed any new add-ons in quite a while - actually since I bought my current PC in mid '18.  
Just now (using Win10 with Firefox 66.0, 64 bit) I tried to install a new one (and then, in case the first one was incompatible, several more), and all I could see was “only on Firefox - download Firefox now”.  
If I follow that link, I eventually see “You already have Firefox”.  
In case this should now be mandatory, I logged in; no change.

Can someone please help me in my ignorance?

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**Author:** ![freaktechnik](https://sea1.discourse-cdn.com/flex001/user_avatar/discourse.mozilla.org/freaktechnik/32/37766_2.png) [@freaktechnik](https://discourse.mozilla.org/u/freaktechnik)\
**Post date:** [March 22, 2019, 11:41am UTC](https://discourse.mozilla.org/t/how-to-download-an-add-on/37275/2 "2019-03-22T11:41:30Z")

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Could you post links to where you were trying to download these extensions from?

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**Author:** ![jscher2000](https://sea1.discourse-cdn.com/flex001/user_avatar/discourse.mozilla.org/jscher2000/32/28202_2.png) [@jscher2000](https://discourse.mozilla.org/u/jscher2000)\
**Post date:** [March 22, 2019, 3:02pm UTC](https://discourse.mozilla.org/t/how-to-download-an-add-on/37275/3 "2019-03-22T15:02:44Z")

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The Add-ons site is sensitive to certain changes to your user agent string. If you check the red text on the following page, does it have any variance from the usual:

Test page: [https://www.jeffersonscher.com/res/jstest.php](https://www.jeffersonscher.com/res/jstest.php)

Normal for your configuration: **Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:66.0) Gecko/20100101 Firefox/66.0**

Changes could be caused by settings, extensions, or external proxies. For settings, see:

[https://support.mozilla.org/kb/how-reset-default-user-agent-firefox](https://support.mozilla.org/kb/how-reset-default-user-agent-firefox)

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**Author:** ![marabu.too](https://avatars.discourse-cdn.com/v4/letter/m/b487fb/32.png) [@marabu.too](https://discourse.mozilla.org/u/marabu.too)\
**Post date:** [March 25, 2019, 7:20am UTC](https://discourse.mozilla.org/t/how-to-download-an-add-on/37275/4 "2019-03-25T07:20:59Z")

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Thanks for the prompt answers!

@jscher2000

Mozilla/5.0 (Windows NT 10.0; rv:66.0 ) Gecko/20100101 Firefox/66.0 anonymized by Abelssoft 1845082249

I suppose it may be the anonymiser; installing that add-on is not urgent, so I’ll take a closer look next weekend.

@freaktechnik

no particular links; I simply clicked on  
“three lines” -\> add-ons -\> Discover add-ons  
and then took a closer look at a number of them when the one I’d been looking for couldn’ be downloaded.

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**Author:** ![freaktechnik](https://sea1.discourse-cdn.com/flex001/user_avatar/discourse.mozilla.org/freaktechnik/32/37766_2.png) [@freaktechnik](https://discourse.mozilla.org/u/freaktechnik)\
**Post date:** [March 25, 2019, 11:50am UTC](https://discourse.mozilla.org/t/how-to-download-an-add-on/37275/5 "2019-03-25T11:50:23Z")

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Yeah, abelssoft’s UA anonymizer is what’s messing up AMO.

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**Author:** ![marabu.too](https://avatars.discourse-cdn.com/v4/letter/m/b487fb/32.png) [@marabu.too](https://discourse.mozilla.org/u/marabu.too)\
**Post date:** [April 2, 2019, 7:29am UTC](https://discourse.mozilla.org/t/how-to-download-an-add-on/37275/6 "2019-04-02T07:29:43Z")

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Strange - I first disabled the anonimiser function, then unticked “start with Windows” and rebooted, but the message I get when clicking on  
[https://www.jeffersonscher.com/res/jstest.php](https://www.jeffersonscher.com/res/jstest.php)  
is still the same.  
I looked through the list of processes in Task Manager, but if anything connected to the anonymiser is still running, I certainly didn’t recognise it.

Luckily, there isn’t currently any add-on I need/want to install, but the inability to do so DOES bother me (a bit).

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**Author:** ![freaktechnik](https://sea1.discourse-cdn.com/flex001/user_avatar/discourse.mozilla.org/freaktechnik/32/37766_2.png) [@freaktechnik](https://discourse.mozilla.org/u/freaktechnik)\
**Post date:** [April 2, 2019, 11:01am UTC](https://discourse.mozilla.org/t/how-to-download-an-add-on/37275/7 "2019-04-02T11:01:12Z")

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That’s because it likely modified your Firefox profile and doesn’t undo the modification when you uninstall it.

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**Author:** ![marabu.too](https://avatars.discourse-cdn.com/v4/letter/m/b487fb/32.png) [@marabu.too](https://discourse.mozilla.org/u/marabu.too)\
**Post date:** [April 5, 2019, 5:38am UTC](https://discourse.mozilla.org/t/how-to-download-an-add-on/37275/8 "2019-04-05T05:38:47Z")

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@freaktechnik

Thanks - that was it.

I know very little about about:config, but luckily just searching for “anonym” got me the very string mentioned above - still with “anonymized…”.  
All I had to do was delete that bit of the string, and now I can once again install add-ons!

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<div class="post-metadata">

**Author:** ![marabu.too](https://avatars.discourse-cdn.com/v4/letter/m/b487fb/32.png) [@marabu.too](https://discourse.mozilla.org/u/marabu.too)\
**Post date:** [April 5, 2019, 5:47am UTC](https://discourse.mozilla.org/t/how-to-download-an-add-on/37275/9 "2019-04-05T05:47:12Z")

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@jscher2000

Thanks AGAIN!

My bad: if I had also clicked on your second link when you posted it (and not waited until today), my little problem would have been solved much sooner!