There are a few more potential replacements for Flagfox (although quick note, it looks like the dev is working on updating Flagfox to be compatible):
Is there an alternative for Window Master addon for Quantum, please?
If not, is there an option for Window Master itself to be compatible with Quantum with new version and how can I know whether and when it will be available?
Thanks for response.
In-browser Find and Replace functionality for general text editing.
https://addons.mozilla.org/en-GB/firefox/addon/find-replace-for-text-editing/
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Can I suggest my own addon WX Download Status Bar.
As a replacement for Download Status Bar.
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Great work Joseph! I used âDownload Status Barâ and your webextensions addon is perfect as a substitute. 
Greetings.
Hi! Here are the addons that I used all the time. Please donât forget them 
- Go Parent Folder (by White Alice0775)
https://addons.mozilla.org/en-US/firefox/addon/go-parent-folder/ - FlashGot Mass Downloader (by Giorgio Maone)
https://addons.mozilla.org/en-US/firefox/addon/flashgot/ - URL Alias (zibada)
https://addons.mozilla.org/en-US/firefox/addon/url-alias-8703/ - Copy Link URL (by F. Russell)
https://addons.mozilla.org/en-US/firefox/addon/copy-link-url/
I looked for replacements, but I couldnât find any WebExtensions that would do the same job. Itâs really hard to live without these addons! Thank you.
Hi @smndv! I have some mixed news about these add-ons
Copy Link - it looks like Copy Link URL WE might be a good replacement.
It looks like Go Parent Folder has been removed by the developer. 
Can you describe some of its functionality? We might be able to find a replacement.
FlashGotâs developer has expressed interest in updating this extension. He had his hands full last year updating one of this other extensions in time for the Quantum launch, but hopefully weâll see more news about FlashGot soon.
Unfortunately, it doesnât look like there is a 1:1 replacement for URL Alias. Would another bookmark manager help?
Hi, Caitlin. Thanks for your reply.
And thank you for recommending Copy Link URL WE. I ended up installing Text Linky Tool, which seems to be a more comprehensive version of the same extension.
As for Go Parent Folder, hereâs my usage scenario: I keep my bookmarks super organized in multi-level folders! Now, there are two problems:
First, Firefoxâs built-in library does not support folder searchâwhich is heart-breaking! 
Second, many times I lookup a bookmark and I want to find the folder that it belongs to. Go Parent Folder (by White Alice0775) does exactly that.
For instance, letâs say Iâm looking in my bookmarks for some medical information websites, and I remember that drugs<.>com is one of them. So, in my bookmarks, I search for drugs<.>com. Then I can right-click in that entry, and click âGo Parent Folderâ, and it would take me to the folder that it belongs toâhere, âHealth and Medicine/Medical Information/â, which contains all sorts of similar websites that I have bookmarked (e.g., medscape<.>com, uptodate<.>com).
Right now I am using Bookmarks Manager and Viewer as a replacement, but it has some UI issues.
Iâm glad to hear that the FlashGotâs developer is planning to update the extension for FFQ. I look forward to it.
Finally, URL Alias⌠I use URL Alias to create handy shortcuts for URLs. For instance, if I want to lookup a word in the Merriam-Webster dictionary, all I have to do is enter âmw applesâ in Firefoxâs Awesome Bar. URL Alias will automatically replace it with https://www.merriam-webster.com/dictionary/apples?pronunciation&lang=en_us. Or I can enter âfbmâ to open the Facebook Messenger (https://www.facebook.com/messages/t/).
Sorry if itâs too long. Thanks again
@smndnv: Firefox has the url alias feature you want built-in already. No need for extensions.
Check out: http://kb.mozillazine.org/Using_keyword_searches
Or in short: Rightclick in the search field of merriam-webster dictionary, select âadd a keyword for this searchâ, which will store a bookmark with a keyword. Once this is done, you can type â<your keyword> <your search words>â and itâll do what you want. You can even edit existing bookmarks to have a keyword.
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@Lusito: Thanks for the info! I had no idea Firefox had this functionality built in.
While I prefer defining the URL aliases in a list and keep them separate from the bookmarks (because to me they have very different functionalities), the Keyword Searches that you mentioned works very well for me. I just transformed my list of URL aliases to my bookmarks.
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https://addons.mozilla.org/en-US/firefox/addon/link-text-and-location-copier/
replaces
https://addons.mozilla.org/en-US/firefox/addon/copy-link-url/
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https://addons.mozilla.org/en-US/firefox/addon/save-in/
https://addons.mozilla.org/en-US/firefox/addon/save-image-in-folder-ex/
replaces
https://addons.mozilla.org/en-US/firefox/addon/save-image-in-folder/
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Hi smndnv,
your use case is covered by my addon:
https://addons.mozilla.org/en-US/firefox/addon/at-your-command/
It supports folder search.
Results are currently listed using columns: Name, URL, Folder, Index and Added.
You can even sort by folder column.
Go to Parent Folders command is also available.
uMatrix also takes care of what No cookie for Google search used to do, but itâs not found by the âfind a replacementâ link.
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Thanks, weâll look into it!