The text replace functionality works well, but there is an issue with the changes to firefox which added vertical tabs and the 'show sidebar' setting.
If we switch to vertical tabs or enable the sidebar then it adds an icon for this extension, and it cannot be removed or disabled.
Please update the extension to fix this or tell us how to have the sidebar visible without the extension icon.

So far working as intended but I will need to use it a bit more to see. I found that to add a group of words to replace or have multiple words replaced AND to automatically replace when loading a new page you need to: 1). Go to manage extensions 2). Click the 3 dots next to this extension 3). Hit options 4). For auto replacing, at the bottom of the options page at "Other Settings", check the box for "Apply automatic substitutions on page load" 5). To add a list of words, hit the blue "Add" at the top 6). Select "Substitutions" instead of "URLs" 7). From there you can add your words and their replacement and change the name of the list too 8). Hit "OK" and it should work from now on!

Works as described. Replace method doesn't mess w/ Google Translated webpages' formatting, so I can use Stylus to get rid of those annoying paragraph indents.

Une extension que j'utilisais il y a bien longtemps et que j'avais perdue de vue. Je viens de la réinstaller sur mon ordi actuel, toujours aussi efficace.

Need checkbox :
start with,
end with,
keep case sizing,
and to take in consideration of lang="?" of html page pro list.

Auto case sensitivity, to adapt replacement to a term, without need to add multiple time the same term with letter variant (capital minuscule).

Like AutoHotKey ::TC0?:: ‖ ::TC0::

; ? (question mark) :
;--------------------
;The hotstring will be triggered even when it is inside another word; that is, when the character typed immediately before it is alphanumeric.
;For example, if :?:al::airline is a hotstring, typing "practical " would produce "practicairline ".
;Use ?0 to turn this option back off.

; C: (Case sensitive) :
;----------------------
;When you type an abbreviation, it must exactly match the case defined in the script.
;Use C0 to turn case sensitivity back off.

Adding new term in end of list is painful and could be reversed,

also sorting list would be cool,

and a checkbox to set a replace as important or not, to made them first.

To add U.R.L. filtering to prevent to act in some URL.

And to use import export, common standard format pro replace / correction, to be able to use them elsewere (Word, Write, other program of this kind).

i added this exstention to replace my deadname, didnt do shit

FoxReplace rocks. Been using it for about 11 years. People online grow dumber and more aggravating every year but this add-on keeps their crap off the screen, easily and reliably.

Simple clear and easy to use so far. Search and replace text, it does what is says. Haven't done extensive testing to see if there are any issues as others have reported, but has been pretty solid for me.

What is the privacy policy of this add-on? Will change the rating to 5 if addon is privacy-respecting.

So far so good. I managed to make it work from options, but no thanks to the explanations of the author, which are non-existent, and the interface is also not intuitive. There is still a thing or two that I don't get, but I don't need it for now. For example the auto/auto-manual/manual stuff (I've put "auto" and it seems to work for what I want, but not clear what the other options do). Also the HTML output only/input&output; I have no clue what it means. Finally, the URLs to be typed. What does that do? Also right click and paste works only if you start typing something in a blued field, delete that and then paste.
A short (and good) explanation would be necessary.

Makes the internet more bearable for me.

edit:
The extension seems to disable itself anytime I restart Firefox. Is there any way to fix this?

This is a very simple application. It mostly does what I needed. To simply replace every instance of WORD with OTHERWORD, while viewing/reading web pages. Well done.

Suggestions for future updates.

1. Allow more than 1 word to be replaced, although, this may be possible already, and I'm simply ignorant of the ability/syntax (ie. comma separated, etc)

2. When I toggle Reader mode, the app does not replace the text within the web page. Having the same functionality in reader mode, would be useful and a common use case, I believe.

Thanks!