web-ext will not work when following the instructions without having
this diff applied:
```
$ ./node_modules/web-ext/bin/web-ext run -s src/
(node:41062) Warning: Accessing non-existent property 'cat' of module exports inside circular dependency
(Use `node --trace-warnings ...` to show where the warning was created)
(node:41062) Warning: Accessing non-existent property 'cd' of module exports inside circular dependency
(node:41062) Warning: Accessing non-existent property 'chmod' of module exports inside circular dependency
(node:41062) Warning: Accessing non-existent property 'cp' of module exports inside circular dependency
(node:41062) Warning: Accessing non-existent property 'dirs' of module exports inside circular dependency
(node:41062) Warning: Accessing non-existent property 'pushd' of module exports inside circular dependency
(node:41062) Warning: Accessing non-existent property 'popd' of module exports inside circular dependency
(node:41062) Warning: Accessing non-existent property 'echo' of module exports inside circular dependency
(node:41062) Warning: Accessing non-existent property 'tempdir' of module exports inside circular dependency
(node:41062) Warning: Accessing non-existent property 'pwd' of module exports inside circular dependency
(node:41062) Warning: Accessing non-existent property 'exec' of module exports inside circular dependency
(node:41062) Warning: Accessing non-existent property 'ls' of module exports inside circular dependency
(node:41062) Warning: Accessing non-existent property 'find' of module exports inside circular dependency
(node:41062) Warning: Accessing non-existent property 'grep' of module exports inside circular dependency
(node:41062) Warning: Accessing non-existent property 'head' of module exports inside circular dependency
(node:41062) Warning: Accessing non-existent property 'ln' of module exports inside circular dependency
(node:41062) Warning: Accessing non-existent property 'mkdir' of module exports inside circular dependency
(node:41062) Warning: Accessing non-existent property 'rm' of module exports inside circular dependency
(node:41062) Warning: Accessing non-existent property 'mv' of module exports inside circular dependency
(node:41062) Warning: Accessing non-existent property 'sed' of module exports inside circular dependency
(node:41062) Warning: Accessing non-existent property 'set' of module exports inside circular dependency
(node:41062) Warning: Accessing non-existent property 'sort' of module exports inside circular dependency
(node:41062) Warning: Accessing non-existent property 'tail' of module exports inside circular dependency
(node:41062) Warning: Accessing non-existent property 'test' of module exports inside circular dependency
(node:41062) Warning: Accessing non-existent property 'to' of module exports inside circular dependency
(node:41062) Warning: Accessing non-existent property 'toEnd' of module exports inside circular dependency
(node:41062) Warning: Accessing non-existent property 'touch' of module exports inside circular dependency
(node:41062) Warning: Accessing non-existent property 'uniq' of module exports inside circular dependency
(node:41062) Warning: Accessing non-existent property 'which' of module exports inside circular dependency
Applying config file: ./package.json
Running web extension from /home/andre/Git/multi-account-containers/src
Use --verbose or open Tools > Web Developer > Browser Console to see logging
WebExtError: Temporary add-on installation is not supported in this version of Firefox (you need Firefox 49 or higher). For older Firefox versions, use --pre-install
at FirefoxDesktopExtensionRunner._callee6$ (/home/andre/Git/multi-account-containers/node_modules/web-ext/dist/webpack:/src/extension-runners/firefox-desktop.js:273:19)
at tryCatch (/home/andre/Git/multi-account-containers/node_modules/web-ext/node_modules/regenerator-runtime/runtime.js:62:40)
at Generator.invoke [as _invoke] (/home/andre/Git/multi-account-containers/node_modules/web-ext/node_modules/regenerator-runtime/runtime.js:296:22)
at Generator.prototype.<computed> [as throw] (/home/andre/Git/multi-account-containers/node_modules/web-ext/node_modules/regenerator-runtime/runtime.js:114:21)
at step (/home/andre/Git/multi-account-containers/node_modules/web-ext/dist/webpack:/node_modules/babel-runtime/helpers/asyncToGenerator.js:17:1)
at /home/andre/Git/multi-account-containers/node_modules/web-ext/dist/webpack:/node_modules/babel-runtime/helpers/asyncToGenerator.js:30:1
at processTicksAndRejections (node:internal/process/task_queues:93:5)
```
web-ext will work when following the instructions with having this diff
applied:
```
$ web-ext run -s src/
Applying config file: ./package.json
Running web extension from /home/andre/Git/multi-account-containers/src
Use --verbose or open Tools > Web Developer > Browser Console to see logging
Installed /home/andre/Git/multi-account-containers/src as a temporary add-on
The extension will reload if any source file changes
Press R to reload (and Ctrl-C to quit)
```
I copied the wording from
2184fee75a/README.md
I guess the underlying problem is that the web-ext version specified in
the package.json is very outdated. By installing the web-ext tool via
the provided instructions it fixes the problem.
Furthermore, the `webextensions-examples` repo doesn't specify web-ext
in their package.json which means that installing web-ext via the
provided instructions seems to be the preferred way. (So maybe web-ext
should be removed from the package.json entirely?)
Fixes#1926
Hypothesis:
On receiving onChanged event of browser.storage.sync, sync will try to
_merge_ the container data and backup the merged data. One of the merging
process is called reconcileSiteAssignments in which sync will remove
assigned site form the delete site list. On each removal sync will tell
assignManager, the one who hold container data locally, to remove it as
well. In turn the assignManager will remove *and then* tell sync to
backup the data. This causes the backup process in sync to be invoked
multiple times, one from the sync process and one for each of removed
assigned site list. To make matters worse, the backup from removal of
assigned site list will run in parallel from each others.
This might fixes#1691.
