The add on helps to selectively remove cookies based on a pipe delimited exception list. It deletes cookies except the ones in the exception list. The exception list is in the options of the add-on and can be edited.

Selective Cookie Removal
Selective Cookie Removal is a Firefox add-on that allows users to delete cookies selectively. By specifying an exception list in the add-on options, users can retain essential cookies while removing the rest.
Add-on stats
Manifest V2
Firefox on Android: Yes
Permissions:
- cookies
- storage
- <all_urls>
Size: 20.33K
Email: ns*****@yahoo.com
Ranking
Other platforms
Not available on Chrome
Not available on Android
Not available on Edge
User reviews
A long time ago I had used the selectivecookiedelete add-on for Firefox. It was great but unfortunately has disappeared.
This add-on, Selectively remove cookies, is similar but is extremely limited in what it can do compared to the former selectivecookiedelete.
The good news - This add-on deletes cookies other than the ones in your whitelist.
The bad news:
• It defaults to an empty whitelist and thus instantly deletes all cookies.
• It only deletes cookies when you click the icon on the toolbar. There is no option for example to delete the cookies every time you close or exit Firefox.
• Figuring out how to configure the whitelist is not intuitive. As there is no documentation the steps are:
1) Right click on Selectively remove cookies in the list of add-ons and select Manage Extension
2) Click the [...] button in the upper-right corner and select Options
• When you click on "Selectively remove cookies" it shows you a list of the cookies it deleted but there is no way to export the list or to load it into the copy/paste buffer. Thus there is no way to review the list to see if I should be adding some sites to the whitelist.
If you click "Selectively remove cookies" again it shows you an empty list ad the cookies have been deleted.
Thus, you get one look at the list and can't do a thing with it other than visually look it over and to make notes on a piece of paper.
You need to write on paper because if you switch to another application the displayed list closes and you can't retrieve it.
I suppose you could take a video with your phone and scroll through the list to retain a record.
• This add-on does not know about LocalStorage. It used to be that cookies were the only way for web sites to save information on your computer. People got wise to this, started deleting cookies, and cookie managers such as Selectively remove cookies were written to give us more control over the information web sites were storing on our computers. Besides cookies, web browsers also allow sites to use something called LocalStorage which is similar to cookies.
by mkupper, 2021-12-13
by Firefox user 14211678, 2019-08-23
Deleted all my important cookies when I went to configure it. AVOID. I'm going to need hours to fix the mess that idiotic thing caused.
by mm78, 2018-03-11
Add-on safety
Risk impact
Selectively remove cookies requires a few sensitive permissions. Exercise caution before installing.
Risk impact analysis details
- Critical Allows access to all websites, posing a significant security risk as it can monitor and modify data from any visited site.
- Low ******* ****** ** *** ********* ********
Risk likelihood
Selectively remove cookies is probably trust-worthy. Prefer other publishers if available. Exercise caution when installing this add-on.
Risk likelihood analysis details
- High This extension has low user count. Unpopular extensions may not be stable or safe.
- Medium **** ********* *** *** **** *******
- Low **** ********* *** ******* **** **** * ****** **** ***** ******** *** **** ****** ** ** ****** *** *****
- Low **** ********* *** ***** **** **** * ****** **** ***** ********** *** **** ****** ** ** ****** *** *****
Upgrade to see full risk analysis details
Similar add-ons
Here are some Firefox add-ons that are similar to Selectively remove cookies:

Cookies Remover
1

Cookies Remover
1

Konstantin Glukhov
15

Watkins
-

Hi88
-

SvenP
1

dsrini-open
80

Manuel Reimer
31

Throvn
62